Biology Biodiversity Test Online MCQs

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Question 1

1. Viruses are classified on the basis of:

Answer

Number of ribosomes

Answer

Type of nucleic acid

Answer

Shape and size only

Question 2

2. The function of reverse transcriptase is to:

Answer

Convert protein into DNA

Answer

Replicate DNA

Answer

Convert RNA into DNA

Answer

Convert DNA into RNA

Question 3

3. Which structure is shared by all viruses?

Answer

Protein coat

Answer

Mitochondria

Question 4

4. Which virus leads to the disease AIDS?

Question 5

5. A virus cannot reproduce unless it:

Answer

Absorbs sunlight

Answer

Is in water

Answer

Has nutrients

Answer

Is inside a host cell

Question 6

6. Which virus affects the liver?

Answer

Hepatitis virus

Answer

Polio virus

Question 7

7. Which virus infects bacteria?

Answer

Retrovirus

Answer

Baculovirus

Answer

Bacteriophage

Answer

Orthomyxovirus

Question 8

8. Which type of virus causes cervical cancer?

Question 9

9. Which part of the virus determines its host specificity?

Answer

Capsid proteins or envelope glycoproteins

Answer

Enzyme content

Question 10

10. Which viral disease is sexually transmitted?

Question 11

11. What is the incubation period of HIV before symptoms of AIDS appear?

Answer

1–2 weeks

Answer

Several years

Answer

Immediate symptoms

Answer

2–4 months

Question 12

12. Why are viruses considered obligate parasites?

Answer

They are photosynthetic

Answer

They require a host to reproduce

Answer

They live independently

Answer

They are cellular

Question 13

13. Which of the following is considered an acellular organism?

Question 14

14. Who was awarded the Nobel Prize for work on the HIV virus?

Answer

Edward Jenner

Answer

Louis Pasteur

Answer

Jonas Salk

Answer

Luc Montagnier

Question 15

15. Which type of virus causes the common cold?

Answer

Influenza virus

Answer

Rhinovirus

Answer

Rabies virus

Question 16

16. How are viruses different from bacteria?

Answer

Viruses have nuclei

Answer

Viruses need a host to replicate

Answer

Bacteria can’t reproduce

Answer

Bacteria are acellular

Question 17

17. What is the main mode of transmission for HIV?

Answer

Sexual contact and blood

Answer

Contaminated food

Answer

Insect bites

Question 18

18. Which enzyme do viruses lack?

Answer

RNA polymerase

Answer

Reverse transcriptase

Question 19

19. The outer envelope of some viruses is made of:

Answer

Lipid membrane

Answer

Peptidoglycan

Question 20

20. Which of the following diseases is NOT caused by a virus?

Answer

Tuberculosis

Question 21

21. Which of the following best describes HIV?

Answer

Plant virus

Answer

Non-infectious virus

Answer

RNA virus with reverse transcriptase

Question 22

22. The shape of a bacteriophage resembles:

Answer

Lunar lander or tadpole

Question 23

23. Who discovered the first virus?

Answer

Robert Hooke

Answer

Louis Pasteur

Answer

Edward Jenner

Answer

Martinus Beijerinck

Question 24

24. Which virus has both DNA and a lipid envelope?

Answer

Polio virus

Answer

Herpes simplex virus

Answer

Influenza virus

Question 25

25. The genetic material of a virus can be:

Answer

Either DNA or RNA, but not both

Answer

Both DNA and RNA in the same virus

Question 26

26. Viruses are considered living when they:

Answer

Are in crystalline form

Answer

Are in air

Answer

Are inside host cells

Answer

Are in water

Question 27

27. The protein coat of a virus is composed of subunits called:

Answer

Capsomeres

Question 28

28. Which of the following viral diseases can be prevented by a vaccine?

Answer

Hepatitis B

Answer

Common cold

Question 29

29. The core of a virus contains:

Answer

DNA or RNA

Answer

Mitochondria

Question 30

30. Viral DNA integrated into the host DNA is called:

Question 31

31. Which component helps the virus to attach to host cells?

Answer

Envelope proteins

Question 32

32. Which of the following viral diseases is prevented using a vaccine?

Answer

Common cold

Answer

Hepatitis B

Question 33

33. What type of nucleic acid is found in HIV?

Answer

Double-stranded RNA

Answer

Single-stranded RNA

Answer

Double-stranded DNA

Answer

Single-stranded DNA

Question 34

34. The protein coat of a virus is called:

Question 35

35. Which of these diseases is not caused by a virus?

Answer

Chickenpox

Question 36

36. Which scientist first observed the mosaic disease in tobacco plants?

Answer

Louis Pasteur

Answer

Dmitri Ivanovsky

Question 37

37. Viruses are inactive:

Answer

In acidic medium

Answer

Outside a host cell

Answer

At high temperatures

Answer

In the presence of light

Question 38

38. Which of the following best describes a virus?

Answer

Prokaryotic organism

Answer

Living cell

Answer

Acellular infectious agent

Answer

Non-living chemical

Question 39

39. Which of the following structures is absent in viruses?

Answer

Nucleic acid

Answer

Protein coat

Question 40

40. Which viral disease causes damage to the immune system?

Question 41

41. Viruses multiply by:

Answer

Binary fission

Answer

Fragmentation

Answer

Host-directed replication

Question 42

42. How is viral RNA replicated in host cells?

Answer

It does not replicate

Answer

By host cell enzymes

Answer

By sunlight

Answer

By virus itself

Question 43

43. The AIDS virus primarily targets:

Answer

Red blood cells

Answer

Helper T-cells

Question 44

44. What shape is the tobacco mosaic virus?

Answer

Icosahedral

Question 45

45. Viruses that infect plants are usually:

Answer

Retroviruses

Answer

DNA viruses

Answer

RNA viruses

Answer

Bacteriophages

Question 46

46. Viruses can be seen with:

Answer

Compound microscope

Answer

Electron microscope

Answer

Light microscope

Answer

Dissecting microscope

Question 47

47. What does the term “virion” refer to?

Answer

Complete, infectious virus particle

Answer

Viral protein only

Answer

Viral toxin

Answer

Viral genome

Question 48

48. Which virus was the first to be crystallized?

Answer

Tobacco mosaic virus

Answer

AIDS virus

Answer

Influenza virus

Answer

Polio virus

Question 49

49. Which enzyme is used by retroviruses to make DNA from RNA?

Answer

DNA polymerase

Answer

RNA polymerase

Answer

Reverse transcriptase

Question 50

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Total Questions:	49
Time Allowed:	25 Minutes
Total Marks:	49
How to Attempt Test:	Please choose the right Option in MCQ-type question.
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Biology Biodiversity Test Online MCQs

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