Biology Biodiversity Test Online MCQs

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Question 1

1. Which virus was the first to be crystallized?

Answer

AIDS virus

Answer

Tobacco mosaic virus

Answer

Polio virus

Answer

Influenza virus

Question 2

2. 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 3

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

Question 4

4. Which enzyme do viruses lack?

Answer

RNA polymerase

Answer

Reverse transcriptase

Question 5

5. The protein coat of a virus is called:

Question 6

6. Viruses are considered living when they:

Answer

Are in crystalline form

Answer

Are in water

Answer

Are inside host cells

Answer

Are in air

Question 7

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

Answer

Influenza virus

Answer

Herpes simplex virus

Answer

Polio virus

Question 8

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

Answer

Chickenpox

Question 9

9. Viruses are inactive:

Answer

Outside a host cell

Answer

In the presence of light

Answer

In acidic medium

Answer

At high temperatures

Question 10

10. The function of reverse transcriptase is to:

Answer

Convert DNA into RNA

Answer

Convert protein into DNA

Answer

Replicate DNA

Answer

Convert RNA into DNA

Question 11

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

Answer

Nucleic acid

Answer

Protein coat

Question 12

12. A virus cannot reproduce unless it:

Answer

Has nutrients

Answer

Is inside a host cell

Answer

Is in water

Answer

Absorbs sunlight

Question 13

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

Answer

Reverse transcriptase

Answer

DNA polymerase

Answer

RNA polymerase

Question 14

14. Why are viruses considered obligate parasites?

Answer

They are cellular

Answer

They live independently

Answer

They are photosynthetic

Answer

They require a host to reproduce

Question 15

15. Which viral disease is sexually transmitted?

Question 16

16. 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 17

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

Answer

Common cold

Answer

Hepatitis B

Question 18

18. Who discovered the first virus?

Answer

Louis Pasteur

Answer

Edward Jenner

Answer

Robert Hooke

Answer

Martinus Beijerinck

Question 19

19. Which type of virus causes cervical cancer?

Question 20

20. Viruses multiply by:

Answer

Fragmentation

Answer

Host-directed replication

Answer

Binary fission

Question 21

21. The core of a virus contains:

Answer

DNA or RNA

Answer

Mitochondria

Question 22

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

Answer

Tuberculosis

Question 23

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

Answer

Common cold

Answer

Hepatitis B

Question 24

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

Answer

Sexual contact and blood

Answer

Insect bites

Answer

Contaminated food

Question 25

25. How are viruses different from bacteria?

Answer

Viruses need a host to replicate

Answer

Viruses have nuclei

Answer

Bacteria are acellular

Answer

Bacteria can’t reproduce

Question 26

26. Which virus infects bacteria?

Answer

Bacteriophage

Answer

Orthomyxovirus

Answer

Baculovirus

Answer

Retrovirus

Question 27

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

Answer

Viral genome

Answer

Viral protein only

Answer

Viral toxin

Answer

Complete, infectious virus particle

Question 28

28. Which virus affects the liver?

Answer

Polio virus

Answer

Hepatitis virus

Question 29

29. The shape of a bacteriophage resembles:

Answer

Lunar lander or tadpole

Question 30

30. Which structure is shared by all viruses?

Answer

Mitochondria

Answer

Protein coat

Question 31

31. How is viral RNA replicated in host cells?

Answer

By virus itself

Answer

By host cell enzymes

Answer

It does not replicate

Answer

By sunlight

Question 32

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

Answer

Capsid proteins or envelope glycoproteins

Answer

Enzyme content

Question 33

33. Which virus leads to the disease AIDS?

Question 34

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

Question 35

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

Answer

Peptidoglycan

Answer

Lipid membrane

Question 36

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

Answer

Capsomeres

Question 37

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

Answer

Luc Montagnier

Answer

Louis Pasteur

Answer

Jonas Salk

Answer

Edward Jenner

Question 38

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

Answer

Double-stranded RNA

Answer

Single-stranded DNA

Answer

Double-stranded DNA

Answer

Single-stranded RNA

Question 39

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

Answer

Envelope proteins

Question 40

40. Which type of virus causes the common cold?

Answer

Rabies virus

Answer

Influenza virus

Answer

Rhinovirus

Question 41

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

Answer

Dmitri Ivanovsky

Answer

Louis Pasteur

Question 42

42. Viruses are classified on the basis of:

Answer

Shape and size only

Answer

Number of ribosomes

Answer

Type of nucleic acid

Question 43

43. Which of the following best describes a virus?

Answer

Prokaryotic organism

Answer

Acellular infectious agent

Answer

Living cell

Answer

Non-living chemical

Question 44

44. Which of the following best describes HIV?

Answer

Plant virus

Answer

Non-infectious virus

Answer

RNA virus with reverse transcriptase

Question 45

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

Question 46

46. Viruses that infect plants are usually:

Answer

RNA viruses

Answer

Retroviruses

Answer

Bacteriophages

Answer

DNA viruses

Question 47

47. What shape is the tobacco mosaic virus?

Answer

Icosahedral

Question 48

48. The AIDS virus primarily targets:

Answer

Helper T-cells

Answer

Red blood cells

Question 49

49. Viruses can be seen with:

Answer

Light microscope

Answer

Electron microscope

Answer

Dissecting microscope

Answer

Compound microscope

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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