Biology Biodiversity Test Online MCQs

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Question 1

1. Which structure is shared by all viruses?

Answer

Protein coat

Answer

Mitochondria

Question 2

2. Viruses that infect plants are usually:

Answer

DNA viruses

Answer

Retroviruses

Answer

Bacteriophages

Answer

RNA viruses

Question 3

3. Which viral disease is sexually transmitted?

Question 4

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

Answer

Envelope proteins

Question 5

5. Viruses multiply by:

Answer

Host-directed replication

Answer

Fragmentation

Answer

Binary fission

Question 6

6. The shape of a bacteriophage resembles:

Answer

Lunar lander or tadpole

Question 7

7. Which of the following best describes a virus?

Answer

Prokaryotic organism

Answer

Non-living chemical

Answer

Acellular infectious agent

Answer

Living cell

Question 8

8. Viruses are classified on the basis of:

Answer

Number of ribosomes

Answer

Shape and size only

Answer

Type of nucleic acid

Question 9

9. Viruses are inactive:

Answer

At high temperatures

Answer

In the presence of light

Answer

In acidic medium

Answer

Outside a host cell

Question 10

10. The protein coat of a virus is called:

Question 11

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

Answer

Sexual contact and blood

Answer

Contaminated food

Answer

Insect bites

Question 12

12. Which of the following best describes HIV?

Answer

Plant virus

Answer

RNA virus with reverse transcriptase

Answer

Non-infectious virus

Question 13

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

Question 14

14. Which enzyme do viruses lack?

Answer

RNA polymerase

Answer

Reverse transcriptase

Question 15

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

Answer

Double-stranded DNA

Answer

Double-stranded RNA

Answer

Single-stranded DNA

Answer

Single-stranded RNA

Question 16

16. How are viruses different from bacteria?

Answer

Viruses have nuclei

Answer

Viruses need a host to replicate

Answer

Bacteria are acellular

Answer

Bacteria can’t reproduce

Question 17

17. Viruses can be seen with:

Answer

Electron microscope

Answer

Dissecting microscope

Answer

Compound microscope

Answer

Light microscope

Question 18

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

Question 19

19. The core of a virus contains:

Answer

DNA or RNA

Answer

Mitochondria

Question 20

20. Who discovered the first virus?

Answer

Louis Pasteur

Answer

Martinus Beijerinck

Answer

Robert Hooke

Answer

Edward Jenner

Question 21

21. Viruses are considered living when they:

Answer

Are in crystalline form

Answer

Are inside host cells

Answer

Are in air

Answer

Are in water

Question 22

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

Question 23

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

Answer

RNA polymerase

Answer

DNA polymerase

Answer

Reverse transcriptase

Question 24

24. Which virus leads to the disease AIDS?

Question 25

25. Which virus was the first to be crystallized?

Answer

Tobacco mosaic virus

Answer

AIDS virus

Answer

Polio virus

Answer

Influenza virus

Question 26

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

Answer

Capsid proteins or envelope glycoproteins

Answer

Enzyme content

Question 27

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

Answer

Common cold

Answer

Hepatitis B

Question 28

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

Answer

Dmitri Ivanovsky

Answer

Louis Pasteur

Question 29

29. The function of reverse transcriptase is to:

Answer

Convert RNA into DNA

Answer

Convert DNA into RNA

Answer

Replicate DNA

Answer

Convert protein into DNA

Question 30

30. A virus cannot reproduce unless it:

Answer

Is in water

Answer

Is inside a host cell

Answer

Absorbs sunlight

Answer

Has nutrients

Question 31

31. 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 32

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

Answer

Protein coat

Answer

Nucleic acid

Question 33

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

Answer

Peptidoglycan

Answer

Lipid membrane

Question 34

34. Why are viruses considered obligate parasites?

Answer

They live independently

Answer

They are photosynthetic

Answer

They are cellular

Answer

They require a host to reproduce

Question 35

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

Answer

Herpes simplex virus

Answer

Influenza virus

Answer

Polio virus

Question 36

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

Answer

1–2 weeks

Answer

Immediate symptoms

Answer

2–4 months

Answer

Several years

Question 37

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

Answer

Tuberculosis

Question 38

38. Which type of virus causes the common cold?

Answer

Influenza virus

Answer

Rhinovirus

Answer

Rabies virus

Question 39

39. Which type of virus causes cervical cancer?

Question 40

40. What shape is the tobacco mosaic virus?

Answer

Icosahedral

Question 41

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

Answer

Hepatitis B

Answer

Common cold

Question 42

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

Answer

Edward Jenner

Answer

Jonas Salk

Answer

Luc Montagnier

Answer

Louis Pasteur

Question 43

43. How is viral RNA replicated in host cells?

Answer

It does not replicate

Answer

By virus itself

Answer

By host cell enzymes

Answer

By sunlight

Question 44

44. Which virus affects the liver?

Answer

Polio virus

Answer

Hepatitis virus

Question 45

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

Answer

Complete, infectious virus particle

Answer

Viral toxin

Answer

Viral genome

Answer

Viral protein only

Question 46

46. The AIDS virus primarily targets:

Answer

Red blood cells

Answer

Helper T-cells

Question 47

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

Answer

Chickenpox

Question 48

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

Answer

Capsomeres

Question 49

49. Which virus infects bacteria?

Answer

Baculovirus

Answer

Bacteriophage

Answer

Retrovirus

Answer

Orthomyxovirus

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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