Copy of 250612-Cruise Biology Group-1 Grade 12 Model Exam

Question 1 of 100

1. Question

Assuming independent assortment, how many different phenotypes might you expect to get in the offspring from the parental cross AaBb and AaBb?

Two

Correct Incorrect Correct answer

Sixteen

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Four

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Eight

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Question 2 of 100

2. Question

The part of the female reproductive structure of birds that engulf the yolk and fusion with the sperm cell takes place

Infundibulum

Correct Incorrect Correct answer

Cloaca

Correct Incorrect Correct answer

Magnum

Correct Incorrect Correct answer

Isthmus

Correct Incorrect Correct answer

Question 3 of 100

3. Question

Which of the following statement is true about malaria?

Has an effective vaccine.

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Causes acute watery diarrhea

Correct Incorrect Correct answer

It is caused by a protozoan parasite

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It’s a bacterial infection

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Question 4 of 100

4. Question

Which one of the following is the correct sequences of methods to grow microorganism?

Make zigzag streaks across the surface of agar.
Sterilize the inoculating loop used to transfer microorganisms
Incubate the petri dish to allow the microorganism to grow
Dipping the sterilized loop in a suspension of the bacteria you want to grow.
Sterilization of Petri dishes and nutrient agar for growing microorganisms.

1 → 2 → 3 → 4 → 5

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5 → 2 → 3 → 4 → 1

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5 → 2 → 4 → 1 → 3

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2 → 5 → 1 → 3 → 4

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Question 5 of 100

5. Question

Which one of the following is correct about division Bryophytes of the plant kingdom?

They have xylem and phloem

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They have seeds but not covered by fruits.

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They are restricted to moist and shaded areas.

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They are spermatophytes and do not have flowers.

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Question 6 of 100

6. Question

The step in the life cycle of flowering plants that comes immediately after pollination is

Fertilization

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Seed formation

Correct Incorrect Correct answer

Seed germination

Correct Incorrect Correct answer

Pollen tube formation

Correct Incorrect Correct answer

Question 7 of 100

7. Question

Which one of the following is not true about Conifers?

They are evergreen

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They have narrow needle-shaped leaves

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They have a thick cuticle which enables them to live in hot and cold environment

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They have seeds covered by fruits.

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Question 8 of 100

8. Question

Which of the following pairs are analogous structures?

Wing of bird and wing of butterfly

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Front leg of horse and human arm

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Wing of bird and wing of bat

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Front leg of a frog and wing of bat

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Question 9 of 100

9. Question

Somatostatin (growth-hormone-inhibiting hormone) which helps regulate carbohydrate metabolism by inhibiting the secretion of glucagon is secreted by

Pancreas

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Adrenal gland

Correct Incorrect Correct answer

Thyroid gland

Correct Incorrect Correct answer

Parathyroid gland

Correct Incorrect Correct answer

Question 10 of 100

10. Question

The part of the kidney tubule where much of the reabsorption takes place and all of the glucose is actively taken back into the blood is

Loop of Henle

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Bowman’s capsule

Correct Incorrect Correct answer

First coiled (convoluted) tubule

Correct Incorrect Correct answer

Second coiled (convoluted) tubule

Correct Incorrect Correct answer

Question 11 of 100

11. Question

Which structure of the ear detects rotational acceleration of the head and body?

Ossicles

Correct Incorrect Correct answer

Cochlea

Correct Incorrect Correct answer

Ear drum

Correct Incorrect Correct answer

Semicircular canals

Correct Incorrect Correct answer

Question 12 of 100

12. Question

Which of the following components of biogas are produced first during anaerobic digestion of organic wastes by different communities of anaerobic microbes?

Methane

Correct Incorrect Correct answer

Acetate, CO₂ and hydrogen

Correct Incorrect Correct answer

Organic acid, alcohol and CO₂

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CH₄ and ethanol

Correct Incorrect Correct answer

Question 13 of 100

13. Question

The reservoir of infection for one of the following bacteria could be soil:

Mycobacterium tuberculosis

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Neisseria gonorrhoeae

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Salmonella typhi

Correct Incorrect Correct answer

Clostridium tetani

Correct Incorrect Correct answer

Question 14 of 100

14. Question

The bacterium used as a source of enzyme for the amplification of DNA in PCR is

Bacillus thuringiensis

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Thermus aquaticus

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Agrobacterium tumefaciens

Correct Incorrect Correct answer

Rhizopus

Correct Incorrect Correct answer

Question 15 of 100

15. Question

Which fungus is common in food spoilage?

Mucor

Correct Incorrect Correct answer

Saccharomyces cerevisiae

Correct Incorrect Correct answer

Mushroom

Correct Incorrect Correct answer

Tinea pedis

Correct Incorrect Correct answer

Question 16 of 100

16. Question

The process of converting glucose into pyruvate is an example of

Anabolism

Correct Incorrect Correct answer

Fermentation

Correct Incorrect Correct answer

Catabolism

Correct Incorrect Correct answer

Photosynthesis

Correct Incorrect Correct answer

Question 17 of 100

17. Question

An RNA that transcribes genetic information from DNA in the nucleus with the help of RNA polymerase is

mRNA

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tRNA

Correct Incorrect Correct answer

rRNA

Correct Incorrect Correct answer

siRNA

Correct Incorrect Correct answer

Question 18 of 100

18. Question

Which of the following is not an endemic Ethiopian plant?

Tid

Correct Incorrect Correct answer

Zigba

Correct Incorrect Correct answer

Teff

Correct Incorrect Correct answer

Maize

Correct Incorrect Correct answer

Question 19 of 100

19. Question

Incomplete dominance occurs when the phenotype of the hybrid daughter _____.

Is the same as the homozygous recessive parent

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Is the same as the homozygous dominant parent

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Shows a phenotype that is a mix of the two parents

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Can be either phenotype of the homozygous dominant or homozygous recessive parent

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Question 20 of 100

20. Question

A female who is AO (IAi) has children with a male who is BO (IBi). What possible blood types can their children inherit?

Types A, AB, B and O

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Types AB and O

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Types A and B

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Types A, B and O

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Question 21 of 100

21. Question

In competitive inhibition, inhibitors bear a close structural similarity with the

Co-enzyme

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Co-factor

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Prosthetic group

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Substrate

Correct Incorrect Correct answer

Question 22 of 100

22. Question

The enzymes that break up nucleic acid into nucleotides are called

Nucleases

Correct Incorrect Correct answer

DNA helicase

Correct Incorrect Correct answer

Primase

Correct Incorrect Correct answer

Hydrolases

Correct Incorrect Correct answer

Question 23 of 100

23. Question

Which of the following enzyme inhibitions shows decreased Km value?

Competitive inhibition

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Un-competitive inhibition

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Non-competitive inhibition

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Feedback inhibition

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Question 24 of 100

24. Question

Which one of the following unicellular organisms carries out photosynthesis in aquatic ecosystems?

Chlamydomonas

Correct Incorrect Correct answer

Saccharomyces

Correct Incorrect Correct answer

Planaria

Correct Incorrect Correct answer

Plasmodium

Correct Incorrect Correct answer

Question 25 of 100

25. Question

Which of the following is the most likely explanation for a high rate of crossing-over between two genes?

The two genes are far apart on the same chromosome.

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The two genes are both located near the centromere.

Correct Incorrect Correct answer

The two genes are sex-linked.

Correct Incorrect Correct answer

The two genes code for the same protein.

Correct Incorrect Correct answer

Question 26 of 100

26. Question

Which one of the following is not true about protein synthesis?

Only one strand of DNA is the coding strand.

Correct Incorrect Correct answer

Antisense strand of DNA is used as template strand.

Correct Incorrect Correct answer

Post-transcriptional modification occurs after the process of translation.

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Translation of protein requires energy.

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Question 27 of 100

27. Question

Which of the following is not true about negative feedback mechanism?

Accelerates a change in the body’s physiological condition.

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Reverses the direction of the stimulus or any deviation from the normal.

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It maintains homeostasis.

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Temperature regulation in humans is an example of negative feedback.

Correct Incorrect Correct answer

Question 28 of 100

28. Question

Why is sexual reproduction useful?

It takes place in a very short period of time.

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It results in the rapid production of many offspring.

Correct Incorrect Correct answer

It allows organisms to survive in an unpredictable environment.

Correct Incorrect Correct answer

It produces offspring by parthenogenesis.

Correct Incorrect Correct answer

Question 29 of 100

29. Question

Enzymes that cleave bonds by means other than hydrolysis or oxidation, involving two or more substrates in one reaction, are

Transferases

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Hydrolases

Correct Incorrect Correct answer

Lyases

Correct Incorrect Correct answer

Ligases

Correct Incorrect Correct answer

Question 30 of 100

30. Question

Why do sliced apples turn brown?

Oxidation by polyphenol oxidase

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Reduction by polyphenol oxidase

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Phosphorylation of ADP into ATP

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Dehydrogenation of NAD

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Question 31 of 100

31. Question

Which of the following statements is incorrect?

Enzymes are protein in nature

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Enzymes are thermo-labile

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Enzymes are colloidal in nature

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Enzymes are inorganic catalysts

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Question 32 of 100

32. Question

Analyzing pedigrees can reveal all of the following except

Whether a trait is dominant or recessive

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The type of chromosome a trait is linked to

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The genotypes of family members

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The phenotypes of the family members

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Question 33 of 100

33. Question

If a portion of a messenger RNA molecule contains the base sequence A-A-U, the corresponding transfer RNA base sequence is

A-A-U

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G-G-T

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T-T-C

Correct Incorrect Correct answer

U-U-A

Correct Incorrect Correct answer

Question 34 of 100

34. Question

There are three main climate-change mitigation approaches. All of the following routes are conventional mitigation efforts except

Renewable energy

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Nuclear power

Correct Incorrect Correct answer

Fuel switching

Correct Incorrect Correct answer

Soil carbon sequestration

Correct Incorrect Correct answer

Question 35 of 100

35. Question

Which structure of the human ear is part of the inner ear?

Sacculus and Utriculus

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Eustachian tube

Correct Incorrect Correct answer

Three tiny bones

Correct Incorrect Correct answer

Tympanum

Correct Incorrect Correct answer

Question 36 of 100

36. Question

Which technology is developed and designed by engineers by imitating the shape of the beaks of kingfishers?

House-building design

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Aircraft technology

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Bullet trains

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Injection needle

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Question 37 of 100

37. Question

What happens if the core body temperature is too high?

Blood vessels supplying capillaries constrict.

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The body decreases sweating.

Correct Incorrect Correct answer

Blood vessels supplying capillaries dilate.

Correct Incorrect Correct answer

The body shivers to produce heat.

Correct Incorrect Correct answer

Question 38 of 100

38. Question

Which group of white blood cells produces antibodies against foreign antigens?

Macrophages

Correct Incorrect Correct answer

Lymphocytes

Correct Incorrect Correct answer

Phagocytes

Correct Incorrect Correct answer

Thrombocytes

Correct Incorrect Correct answer

Question 39 of 100

39. Question

Which one of the following animal there are no body axis and no plane of symmetry, hence the animal asymmetrical?

Fish

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Human beings

Correct Incorrect Correct answer

Sponges

Correct Incorrect Correct answer

Planaria

Correct Incorrect Correct answer

Question 40 of 100

40. Question

The starting and ending compound of the Calvin cycle is

Phosphoglycerate

Correct Incorrect Correct answer

Phosphoenol pyruvate

Correct Incorrect Correct answer

Ribulose bisphosphate

Correct Incorrect Correct answer

Oxaloacetate

Correct Incorrect Correct answer

Question 41 of 100

41. Question

Which product can be formed in both cyclic and non-cyclic photophosphorylation?

ATP

Correct Incorrect Correct answer

Oxygen

Correct Incorrect Correct answer

NADPH

Correct Incorrect Correct answer

Glucose

Correct Incorrect Correct answer

Question 42 of 100

42. Question

Which one of the following is wrong about complete metamorphosis?

Immature and adults have different form.

Correct Incorrect Correct answer

Immature form is called larva.

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Grasshoppers and cockroaches undergo complete metamorphosis.

Correct Incorrect Correct answer

The life cycle includes egg, larva, pupa and adults.

Correct Incorrect Correct answer

Question 43 of 100

43. Question

Which of the following is true about genetic bottlenecks?

They occur when major environmental changes kill most of the population before reproduction.

Correct Incorrect Correct answer

They usually increase genetic diversity.

Correct Incorrect Correct answer

They reduce the fertility of survivors.

Correct Incorrect Correct answer

They occur when a small group breaks off to form a colony.

Correct Incorrect Correct answer

Question 44 of 100

44. Question

one of the following codon carried by mRNA is an initiator codon or start codons that initiates protein synthesis

UAG

Correct Incorrect Correct answer

AUG

Correct Incorrect Correct answer

UAA

Correct Incorrect Correct answer

UGA

Correct Incorrect Correct answer

Question 45 of 100

45. Question

How many carbon atoms are contained in a single molecule of sucrose?

6

Correct Incorrect Correct answer

12

Correct Incorrect Correct answer

24

Correct Incorrect Correct answer

48

Correct Incorrect Correct answer

Question 46 of 100

46. Question

In the process of amino acid condensation, which one of the following happens?

Oxygen is used up.

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Carbon dioxide is released.

Correct Incorrect Correct answer

Water is released as a by-product.

Correct Incorrect Correct answer

Protein is broken down into amino acids.

Correct Incorrect Correct answer

Question 47 of 100

47. Question

Given the following

1= Pollination; 3 = Pollen grains germination;

2= Seed dispersal; 4 = Flowering; 5 = Seed germination

The correct order of steps in the reproduction of a mature plant is

1, 3, 2, 4, 5

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2, 5, 4, 1, 3

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4, 2, 5, 1, 3

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4, 1, 3, 2, 5

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Question 48 of 100

48. Question

Which group of plants has the greatest diversity?

Angiosperms

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Gymnosperms

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Bryophyta

Correct Incorrect Correct answer

Pteridophyta

Correct Incorrect Correct answer

Question 49 of 100

49. Question

Which reaction occurs in the stroma of the chloroplast?

Carbon fixation

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Photolysis of water

Correct Incorrect Correct answer

Formation of ATP

Correct Incorrect Correct answer

Production of NADPH

Correct Incorrect Correct answer

Question 50 of 100

50. Question

Which one of the following is not a component of DNA nucleotides?

Phosphate group

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Hexose sugar

Correct Incorrect Correct answer

Pentose sugar

Correct Incorrect Correct answer

Organic base

Correct Incorrect Correct answer

Question 51 of 100

51. Question

A small non-protein part that is essential for the proper functioning of the enzyme are

Apoenzyme

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Holoenzyme

Correct Incorrect Correct answer

Cofactor

Correct Incorrect Correct answer

Competitive inhibitor

Correct Incorrect Correct answer

Question 52 of 100

52. Question

Non-competitive inhibitors

Bind to the enzyme’s active site

Correct Incorrect Correct answer

Are affected by substrate concentration

Correct Incorrect Correct answer

Bind to the enzyme’s allosteric site

Correct Incorrect Correct answer

Permanently alter the enzyme

Correct Incorrect Correct answer

Question 53 of 100

53. Question

When heated with Benedict’s reagent, which carbohydrate does NOT cause a color change?

Sucrose

Correct Incorrect Correct answer

Glucose

Correct Incorrect Correct answer

Fructose

Correct Incorrect Correct answer

Galactose

Correct Incorrect Correct answer

Question 54 of 100

54. Question

Which biological molecule and its function is mismatched?

Lipids — markers of the immune system

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Chitin — prevents water loss in insects

Correct Incorrect Correct answer

Phospholipids — basis of plasma membranes

Correct Incorrect Correct answer

Proteins — part of the immune system

Correct Incorrect Correct answer

Question 55 of 100

55. Question

Which one of the following is NOT a component common to all amino acids?

Carboxyl group

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Hydroxyl group

Correct Incorrect Correct answer

Amino group

Correct Incorrect Correct answer

Side group

Correct Incorrect Correct answer

Question 56 of 100

56. Question

During cellular respiration, for each acetyl-CoA molecule the Krebs cycle produces

6 NADH

Correct Incorrect Correct answer

2 FADH₂

Correct Incorrect Correct answer

4 CO₂

Correct Incorrect Correct answer

One ATP

Correct Incorrect Correct answer

Question 57 of 100

57. Question

Which one of the following statements is true about the process of photosynthesis?

It’s a catabolic reaction.

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It’s an exergonic reaction.

Correct Incorrect Correct answer

It releases carbon dioxide.

Correct Incorrect Correct answer

It produces organic macromolecules.

Correct Incorrect Correct answer

Question 58 of 100

58. Question

A method of sterilization for heat-labile substances (such as serum and sugar solutions) that cannot withstand autoclave temperatures is

Incineration

Correct Incorrect Correct answer

Disinfection

Correct Incorrect Correct answer

Tyndallization (tantalization)

Correct Incorrect Correct answer

Flaming

Correct Incorrect Correct answer

Question 59 of 100

59. Question

Which term refers to a prokaryotic cell that is comma-shaped?

Spirillum

Correct Incorrect Correct answer

Coccus

Correct Incorrect Correct answer

Vibrio

Correct Incorrect Correct answer

Bacillus

Correct Incorrect Correct answer

Question 60 of 100

60. Question

Which stage of aerobic respiration does NOT produce CO₂ as a waste product?

Glycolysis

Correct Incorrect Correct answer

Fermentation

Correct Incorrect Correct answer

Link reaction

Correct Incorrect Correct answer

Krebs cycle

Correct Incorrect Correct answer

Question 61 of 100

61. Question

Which statement is correct about C₄ photosynthesis?

Phosphoglycerate is the first product of CO₂ fixation.

Correct Incorrect Correct answer

Formation of C₄ acid and refixation of CO₂ are temporally separated.

Correct Incorrect Correct answer

Plants like wheat and rye are C₄ plants.

Correct Incorrect Correct answer

The Calvin cycle takes place in bundle-sheath cells.

Correct Incorrect Correct answer

Question 62 of 100

62. Question

Which component is present in both Gram-positive and Gram-negative cell walls?

Lipopolysaccharides

Correct Incorrect Correct answer

Peptidoglycan

Correct Incorrect Correct answer

Outer membrane

Correct Incorrect Correct answer

Teichoic acid

Correct Incorrect Correct answer

Question 63 of 100

63. Question

In a population of 1,000 individuals, 360 are AA, 480 are Aa and 160 are aa. The frequency of allele A is

0.7

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0.6

Correct Incorrect Correct answer

0.5

Correct Incorrect Correct answer

0.4

Correct Incorrect Correct answer

Question 64 of 100

64. Question

Nearly all single-celled eukaryotes, whether heterotrophic or photosynthetic, belong to the kingdom

Animalia

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Monera

Correct Incorrect Correct answer

Protista

Correct Incorrect Correct answer

Fungi

Correct Incorrect Correct answer

Question 65 of 100

65. Question

Which of the following activities is NOT carried out in the large intestine?

Absorption of minerals

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Egestion of fiber/cellulose

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Absorption of digestive end-products of food

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Absorption of water

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Question 66 of 100

66. Question

The chamber of the heart which pumps blood to the lung is

Left auricle

Correct Incorrect Correct answer

Left ventricle

Correct Incorrect Correct answer

Right auricle

Correct Incorrect Correct answer

Right ventricle

Correct Incorrect Correct answer

Question 67 of 100

67. Question

A disease caused by uncontrolled production of white blood cells is

Hemophilia

Correct Incorrect Correct answer

Elephantiasis

Correct Incorrect Correct answer

Leukemia

Correct Incorrect Correct answer

Anemia

Correct Incorrect Correct answer

Question 68 of 100

68. Question

The pressure of blood is measured by an instrument called a

Sphygmomanometer

Correct Incorrect Correct answer

Thermometer

Correct Incorrect Correct answer

Stethoscope

Correct Incorrect Correct answer

Klinostat

Correct Incorrect Correct answer

Question 69 of 100

69. Question

A point mutation that converts a codon into a premature stop codon is a

Frameshift mutation

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Silent mutation

Correct Incorrect Correct answer

Nonsense mutation

Correct Incorrect Correct answer

Missense mutation

Correct Incorrect Correct answer

Question 70 of 100

70. Question

All of the following diseases are caused by eating contaminated food except

Salmonellosis

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Botulism

Correct Incorrect Correct answer

Syphilis

Correct Incorrect Correct answer

Listeriosis

Correct Incorrect Correct answer

Question 71 of 100

71. Question

Which one of the following is true about the lysogenic cycle of viral reproduction?

Host DNA is hydrolyzed.

Correct Incorrect Correct answer

It occurs within a short period.

Correct Incorrect Correct answer

Absence of a prophage stage.

Correct Incorrect Correct answer

Viral DNA integrates with host DNA.

Correct Incorrect Correct answer

Question 72 of 100

72. Question

Which one of the following blood transfusion causes agglutination reaction?

Rh⁺ blood into Rh⁻

Correct Incorrect Correct answer

Rh⁺ blood into Rh⁺

Correct Incorrect Correct answer

Rh⁻ blood into Rh⁻

Correct Incorrect Correct answer

Rh⁻ blood into Rh⁺

Correct Incorrect Correct answer

Question 73 of 100

73. Question

An endocrine gland that produces melatonin to control circadian rhythm is the

Pineal gland

Correct Incorrect Correct answer

Thymus gland

Correct Incorrect Correct answer

Pituitary gland

Correct Incorrect Correct answer

Adrenal gland

Correct Incorrect Correct answer

Question 74 of 100

74. Question

A hormone produced by the anterior pituitary gland that regulates the production of Milk is

Oxytocin

Correct Incorrect Correct answer

Prolactin

Correct Incorrect Correct answer

Growth hormone

Correct Incorrect Correct answer

ACTH

Correct Incorrect Correct answer

Question 75 of 100

75. Question

A father with blood type ‘AB’ and a mother with blood type ‘O’ will have children of blood type

‘O’

Correct Incorrect Correct answer

‘AB’

Correct Incorrect Correct answer

‘B’

Correct Incorrect Correct answer

A and B

Correct Incorrect Correct answer

Question 76 of 100

76. Question

Which one of the following bone of the axial skeleton system holes & supposes the neck?

Hyoid

Correct Incorrect Correct answer

Thoracic vertebra

Correct Incorrect Correct answer

Ossicle

Correct Incorrect Correct answer

Cranium

Correct Incorrect Correct answer

Question 77 of 100

77. Question

The extension of the scleratic layer at the front of the human eye is

Pupil

Correct Incorrect Correct answer

Iris

Correct Incorrect Correct answer

Cornea

Correct Incorrect Correct answer

Retina

Correct Incorrect Correct answer

Question 78 of 100

78. Question

Which one of the following part of the human ear is not involved in amplifying sound vibration?

Hammer

Correct Incorrect Correct answer

Eardrum

Correct Incorrect Correct answer

Eustachian tube

Correct Incorrect Correct answer

Ossicles

Correct Incorrect Correct answer

Question 79 of 100

79. Question

What ions leave a Neuron causing the repolarization of the membranes of a Neurone?

Sodium

Correct Incorrect Correct answer

Chloride

Correct Incorrect Correct answer

Potassium

Correct Incorrect Correct answer

Calcium

Correct Incorrect Correct answer

Question 80 of 100

80. Question

Which one of the following stages of respiration can continues even in the absence of oxygen?

Glycolysis

Correct Incorrect Correct answer

Link reaction

Correct Incorrect Correct answer

Krebs cycle

Correct Incorrect Correct answer

Electron transport chain

Correct Incorrect Correct answer

Question 81 of 100

81. Question

Which one of the following diseases can be caused by more than one type of microorganism?

Typhoid

Correct Incorrect Correct answer

Tuberculosis

Correct Incorrect Correct answer

Cholera

Correct Incorrect Correct answer

Gastroenteritis

Correct Incorrect Correct answer

Question 82 of 100

82. Question

Which one of the following groups of organisms is correctly matched with its phylum?

Snail — phylum Annelida

Correct Incorrect Correct answer

Earthworm — phylum Mollusca

Correct Incorrect Correct answer

Starfish — phylum Echinodermata

Correct Incorrect Correct answer

Fish — phylum Arthropoda

Correct Incorrect Correct answer

Question 83 of 100

83. Question

What is the function of the dermis of the skin? It

Acts as protection against heat loss

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Forms a waterproof barrier

Correct Incorrect Correct answer

Contains blood vessels and sweat glands

Correct Incorrect Correct answer

Protects against pathogen entry

Correct Incorrect Correct answer

Question 84 of 100

84. Question

The part of the brain that interprets impulses from the semicircular canals is the

Medulla

Correct Incorrect Correct answer

Cerebrum

Correct Incorrect Correct answer

Cerebellum

Correct Incorrect Correct answer

Hypothalamus

Correct Incorrect Correct answer

Question 85 of 100

85. Question

Under what conditions the urine output from the Kidneys will usually decrease?

On a hot day

Correct Incorrect Correct answer

After drinking water

Correct Incorrect Correct answer

On a cold day

Correct Incorrect Correct answer

After a meal

Correct Incorrect Correct answer

Question 86 of 100

86. Question

In the lock and key model of enzyme mechanism, the key represented by

The enzyme

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The enzyme–substrate complex

Correct Incorrect Correct answer

The substrate

Correct Incorrect Correct answer

The product

Correct Incorrect Correct answer

Question 87 of 100

87. Question

Natan was reading his book, he then looked out of the window to focus his eyes on a tree. What happens the lenses in his eyes?

Thinner

Correct Incorrect Correct answer

Fatter

Correct Incorrect Correct answer

Wider

Correct Incorrect Correct answer

Unchanged

Correct Incorrect Correct answer

Question 88 of 100

88. Question

Researchers in the medicine sector use glucose oxidase in clinostat strips for

Easy diagnosis of diabetes by examining urine samples

Correct Incorrect Correct answer

Reducing mucus viscosity

Correct Incorrect Correct answer

Restoring blood supply to heart muscle

Correct Incorrect Correct answer

Detecting toxic metabolites in the blood

Correct Incorrect Correct answer

Question 89 of 100

89. Question

The stage of mitosis characterized by cytoplasmic division and reformation of the nuclear envelope is

Prophase

Correct Incorrect Correct answer

Metaphase

Correct Incorrect Correct answer

Anaphase

Correct Incorrect Correct answer

Telophase

Correct Incorrect Correct answer

Question 90 of 100

90. Question

A mild hallucinogenic drug that contains a chemical called delta-9-tetra hydro cannabinoid that affects brain cells responsible for memory. Emotion and motivation is

LSD

Correct Incorrect Correct answer

Cocaine

Correct Incorrect Correct answer

Marijuana

Correct Incorrect Correct answer

Heroin

Correct Incorrect Correct answer

Question 91 of 100

91. Question

The swelling at the base of each semi circular canal, containing sensory cells which detects movement of the floid within the canal is detects

Cochlea

Correct Incorrect Correct answer

Ampulla

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Utriculus

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Otolith

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Question 92 of 100

92. Question

The taste sensation usually detected at the back of the tongue is

Sweet

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Bitter

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Sour

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Umami

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Question 93 of 100

93. Question

The endocrine gland at the base of the brain is the

Adrenal

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Parathyroid

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Pituitary

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Thyroid

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Question 94 of 100

94. Question

Which taxonomic group contains the most closely related organisms?

Phylum

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Class

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Genus

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Order

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Question 95 of 100

95. Question

The axon of a motor neuron connects to

Dorsal root

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Sensory receptors

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Central nervous system

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Muscle fibers

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Question 96 of 100

96. Question

Which structure of the breathing system lacks cartilage rings?

Trachea

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Bronchus

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Bronchioles

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Alveolus

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Question 97 of 100

97. Question

Suppose a tourist is interested to study the variety of Birds in Ethiopia. To which part of Ethiopia would you advise him to go?

Semien Mountains

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Bale Mountains

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Rift-valley lakes

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Ogaden region

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Question 98 of 100

98. Question

Which of the following pollutants contains pathogens?

Industrial pollutants

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Agricultural pollutants

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Exhaust from cars

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Sewage and garbage

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Question 99 of 100

99. Question

According to the five-kingdom system, unicellular organisms with a true nucleus are classified under kingdom

Animalia

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Monera

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Protista

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Fungi

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Question 100 of 100

100. Question

Where does production of ATP and NADPH take place?

Fluid matrix

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Stroma

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Cytoplasm

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Thylakoid membrane

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