Biology Biodiversity Test Online MCQs

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Question 1

1. Which viral disease is sexually transmitted?

Question 2

2. Which enzyme do viruses lack?

Answer

RNA polymerase

Answer

Reverse transcriptase

Question 3

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

Answer

Viral toxin

Answer

Viral genome

Answer

Complete, infectious virus particle

Answer

Viral protein only

Question 4

4. Which virus leads to the disease AIDS?

Question 5

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

Answer

Lipid membrane

Answer

Peptidoglycan

Question 6

6. Which virus infects bacteria?

Answer

Retrovirus

Answer

Orthomyxovirus

Answer

Baculovirus

Answer

Bacteriophage

Question 7

7. What shape is the tobacco mosaic virus?

Answer

Icosahedral

Question 8

8. Viruses can be seen with:

Answer

Compound microscope

Answer

Electron microscope

Answer

Dissecting microscope

Answer

Light microscope

Question 9

9. The shape of a bacteriophage resembles:

Answer

Lunar lander or tadpole

Question 10

10. 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 11

11. Which structure is shared by all viruses?

Answer

Mitochondria

Answer

Protein coat

Question 12

12. Which of the following best describes HIV?

Answer

Non-infectious virus

Answer

RNA virus with reverse transcriptase

Answer

Plant virus

Question 13

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

Answer

Common cold

Answer

Hepatitis B

Question 14

14. The core of a virus contains:

Answer

Mitochondria

Answer

DNA or RNA

Question 15

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

Answer

Hepatitis B

Answer

Common cold

Question 16

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

Answer

DNA polymerase

Answer

RNA polymerase

Answer

Reverse transcriptase

Question 17

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

Answer

Chickenpox

Question 18

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

Question 19

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

Question 20

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

Answer

Envelope proteins

Question 21

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

Answer

Capsomeres

Question 22

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

Answer

Contaminated food

Answer

Insect bites

Answer

Sexual contact and blood

Question 23

23. Which virus was the first to be crystallized?

Answer

Polio virus

Answer

Tobacco mosaic virus

Answer

AIDS virus

Answer

Influenza virus

Question 24

24. Viruses multiply by:

Answer

Fragmentation

Answer

Host-directed replication

Answer

Binary fission

Question 25

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

Answer

Tuberculosis

Question 26

26. Which virus affects the liver?

Answer

Hepatitis virus

Answer

Polio virus

Question 27

27. The protein coat of a virus is called:

Question 28

28. Who discovered the first virus?

Answer

Robert Hooke

Answer

Edward Jenner

Answer

Martinus Beijerinck

Answer

Louis Pasteur

Question 29

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

Answer

Several years

Answer

2–4 months

Answer

1–2 weeks

Answer

Immediate symptoms

Question 30

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

Answer

Dmitri Ivanovsky

Answer

Louis Pasteur

Question 31

31. Which of the following best describes a virus?

Answer

Non-living chemical

Answer

Living cell

Answer

Acellular infectious agent

Answer

Prokaryotic organism

Question 32

32. How is viral RNA replicated in host cells?

Answer

By host cell enzymes

Answer

By sunlight

Answer

By virus itself

Answer

It does not replicate

Question 33

33. Viruses are considered living when they:

Answer

Are in crystalline form

Answer

Are in air

Answer

Are in water

Answer

Are inside host cells

Question 34

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

Answer

Herpes simplex virus

Answer

Polio virus

Answer

Influenza virus

Question 35

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

Answer

Edward Jenner

Answer

Louis Pasteur

Answer

Luc Montagnier

Answer

Jonas Salk

Question 36

36. The AIDS virus primarily targets:

Answer

Helper T-cells

Answer

Red blood cells

Question 37

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

Answer

Enzyme content

Answer

Capsid proteins or envelope glycoproteins

Question 38

38. A virus cannot reproduce unless it:

Answer

Absorbs sunlight

Answer

Is in water

Answer

Has nutrients

Answer

Is inside a host cell

Question 39

39. Which type of virus causes the common cold?

Answer

Rabies virus

Answer

Influenza virus

Answer

Rhinovirus

Question 40

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

Answer

Protein coat

Answer

Nucleic acid

Question 41

41. Viruses are classified on the basis of:

Answer

Shape and size only

Answer

Number of ribosomes

Answer

Type of nucleic acid

Question 42

42. How are viruses different from bacteria?

Answer

Viruses need a host to replicate

Answer

Bacteria are acellular

Answer

Bacteria can’t reproduce

Answer

Viruses have nuclei

Question 43

43. The function of reverse transcriptase is to:

Answer

Replicate DNA

Answer

Convert RNA into DNA

Answer

Convert DNA into RNA

Answer

Convert protein into DNA

Question 44

44. 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 45

45. Why are viruses considered obligate parasites?

Answer

They are cellular

Answer

They live independently

Answer

They require a host to reproduce

Answer

They are photosynthetic

Question 46

46. Viruses are inactive:

Answer

Outside a host cell

Answer

In acidic medium

Answer

At high temperatures

Answer

In the presence of light

Question 47

47. Which type of virus causes cervical cancer?

Question 48

48. Viruses that infect plants are usually:

Answer

Bacteriophages

Answer

DNA viruses

Answer

RNA viruses

Answer

Retroviruses

Question 49

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

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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