Biology Biodiversity Test Online MCQs

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Question 1

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

Answer

Louis Pasteur

Answer

Luc Montagnier

Answer

Edward Jenner

Answer

Jonas Salk

Question 2

2. The protein coat of a virus is called:

Question 3

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

Question 4

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

Answer

Lipid membrane

Answer

Peptidoglycan

Question 5

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

Answer

Common cold

Answer

Hepatitis B

Question 6

6. Which virus infects bacteria?

Answer

Baculovirus

Answer

Bacteriophage

Answer

Orthomyxovirus

Answer

Retrovirus

Question 7

7. The genetic material of a virus can be:

Answer

Both DNA and RNA in the same virus

Answer

Either DNA or RNA, but not both

Question 8

8. The core of a virus contains:

Answer

DNA or RNA

Answer

Mitochondria

Question 9

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

Answer

Protein coat

Answer

Nucleic acid

Question 10

10. Which type of virus causes the common cold?

Answer

Rhinovirus

Answer

Rabies virus

Answer

Influenza virus

Question 11

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

Answer

Viral protein only

Answer

Complete, infectious virus particle

Answer

Viral toxin

Answer

Viral genome

Question 12

12. How is viral RNA replicated in host cells?

Answer

By sunlight

Answer

It does not replicate

Answer

By host cell enzymes

Answer

By virus itself

Question 13

13. The shape of a bacteriophage resembles:

Answer

Lunar lander or tadpole

Question 14

14. Viruses can be seen with:

Answer

Electron microscope

Answer

Light microscope

Answer

Compound microscope

Answer

Dissecting microscope

Question 15

15. Which virus leads to the disease AIDS?

Question 16

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

Answer

Herpes simplex virus

Answer

Influenza virus

Answer

Polio virus

Question 17

17. Viruses are inactive:

Answer

In the presence of light

Answer

Outside a host cell

Answer

At high temperatures

Answer

In acidic medium

Question 18

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

Answer

Common cold

Answer

Hepatitis B

Question 19

19. What shape is the tobacco mosaic virus?

Answer

Icosahedral

Question 20

20. Who discovered the first virus?

Answer

Martinus Beijerinck

Answer

Edward Jenner

Answer

Robert Hooke

Answer

Louis Pasteur

Question 21

21. Which structure is shared by all viruses?

Answer

Protein coat

Answer

Mitochondria

Question 22

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

Answer

Chickenpox

Question 23

23. Which type of virus causes cervical cancer?

Question 24

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

Answer

2–4 months

Answer

Immediate symptoms

Answer

Several years

Answer

1–2 weeks

Question 25

25. How are viruses different from bacteria?

Answer

Bacteria can’t reproduce

Answer

Bacteria are acellular

Answer

Viruses have nuclei

Answer

Viruses need a host to replicate

Question 26

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

Question 27

27. Viruses multiply by:

Answer

Host-directed replication

Answer

Binary fission

Answer

Fragmentation

Question 28

28. The function of reverse transcriptase is to:

Answer

Convert protein into DNA

Answer

Convert DNA into RNA

Answer

Convert RNA into DNA

Answer

Replicate DNA

Question 29

29. Which of the following best describes a virus?

Answer

Living cell

Answer

Prokaryotic organism

Answer

Acellular infectious agent

Answer

Non-living chemical

Question 30

30. 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 31

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

Answer

Insect bites

Answer

Contaminated food

Answer

Sexual contact and blood

Question 32

32. Viruses that infect plants are usually:

Answer

Retroviruses

Answer

RNA viruses

Answer

DNA viruses

Answer

Bacteriophages

Question 33

33. Which virus was the first to be crystallized?

Answer

Polio virus

Answer

Tobacco mosaic virus

Answer

AIDS virus

Answer

Influenza virus

Question 34

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

Answer

Capsomeres

Question 35

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

Question 36

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

Answer

Tuberculosis

Question 37

37. Why are viruses considered obligate parasites?

Answer

They are cellular

Answer

They require a host to reproduce

Answer

They are photosynthetic

Answer

They live independently

Question 38

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

Answer

Enzyme content

Answer

Capsid proteins or envelope glycoproteins

Question 39

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

Answer

DNA polymerase

Answer

RNA polymerase

Answer

Reverse transcriptase

Question 40

40. Which enzyme do viruses lack?

Answer

RNA polymerase

Answer

Reverse transcriptase

Question 41

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

Answer

Envelope proteins

Question 42

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

Answer

Dmitri Ivanovsky

Answer

Louis Pasteur

Question 43

43. A virus cannot reproduce unless it:

Answer

Is inside a host cell

Answer

Has nutrients

Answer

Absorbs sunlight

Answer

Is in water

Question 44

44. The AIDS virus primarily targets:

Answer

Helper T-cells

Answer

Red blood cells

Question 45

45. 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 46

46. Which of the following best describes HIV?

Answer

RNA virus with reverse transcriptase

Answer

Non-infectious virus

Answer

Plant virus

Question 47

47. Viruses are classified on the basis of:

Answer

Shape and size only

Answer

Number of ribosomes

Answer

Type of nucleic acid

Question 48

48. Which viral disease is sexually transmitted?

Question 49

49. Which virus affects the liver?

Answer

Hepatitis virus

Answer

Polio virus

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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