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Biology Biodiversity Test Online MCQs

Mustansar KhanLast Updated: October 14, 2025

Important Biodiversity Question and Answer

Total Questions:	49
Time Allowed:	25 Minutes
Total Marks:	49
How to Attempt Test:	Please choose the right Option in MCQ-type question.
Test Helpful For:	Biology Test MDCAT Test FPSC/PPSC/SPSC/KPPSC/BPSC/AJKPSC/NTS Biology Interview Question Answer Universities Entrance Test

Biodiversity Practice Test Online With Explanation

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

Enzyme content

Capsid proteins or envelope glycoproteins

DNA

RNA

2. Viruses are classified on the basis of:

Color

Type of nucleic acid

Shape and size only

Number of ribosomes

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

Double-stranded DNA

Single-stranded DNA

Double-stranded RNA

Single-stranded RNA

4. A virus cannot reproduce unless it:

Is inside a host cell

Is in water

Absorbs sunlight

Has nutrients

5. Which viral disease is sexually transmitted?

Rabies

AIDS

Influenza

Dengue

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

Hepatitis B

Rabies

Common cold

AIDS

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

Protein coat

Cell wall

Nucleic acid

Enzymes

8. Which virus infects bacteria?

Retrovirus

Baculovirus

Orthomyxovirus

Bacteriophage

9. Viruses can be seen with:

Dissecting microscope

Electron microscope

Compound microscope

Light microscope

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

Louis Pasteur

Hershey

Jenner

Dmitri Ivanovsky

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

Bacteria

Virus

Algae

Fungi

12. Which structure is shared by all viruses?

Protein coat

Ribosomes

Cell wall

Mitochondria

13. How are viruses different from bacteria?

Viruses have nuclei

Bacteria are acellular

Bacteria can’t reproduce

Viruses need a host to replicate

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

Herpes simplex virus

Influenza virus

HIV

Polio virus

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

1–2 weeks

Several years

2–4 months

Immediate symptoms

16. Which enzyme do viruses lack?

Reverse transcriptase

RNA polymerase

Ribosomes

Helicase

17. What shape is the tobacco mosaic virus?

Icosahedral

Helical

Complex

Spherical

18. The function of reverse transcriptase is to:

Convert RNA into DNA

Replicate DNA

Convert DNA into RNA

Convert protein into DNA

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

Insect bites

Sexual contact and blood

Contaminated food

Air

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

Louis Pasteur

Edward Jenner

Luc Montagnier

Jonas Salk

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

Measles

Influenza

Hepatitis

Tuberculosis

22. Which virus affects the liver?

Hepatitis virus

Polio virus

Herpes

HIV

23. Viruses are inactive:

Outside a host cell

In the presence of light

At high temperatures

In acidic medium

24. Which virus was the first to be crystallized?

AIDS virus

Tobacco mosaic virus

Polio virus

Influenza virus

25. Which type of virus causes cervical cancer?

HIV

HPV

HSV

HTLV

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26. Which of the following best describes a virus?

Non-living chemical

Prokaryotic organism

Living cell

Acellular infectious agent

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

Tetanus

Mumps

Measles

Chickenpox

28. The AIDS virus primarily targets:

B-cells

Red blood cells

Platelets

Helper T-cells

29. Viruses that infect plants are usually:

RNA viruses

Bacteriophages

Retroviruses

DNA viruses

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

Polio

Measles

Dengue

AIDS

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

Viral toxin

Viral genome

Viral protein only

Complete, infectious virus particle

32. Which type of virus causes the common cold?

HIV

Influenza virus

Rabies virus

Rhinovirus

33. Who discovered the first virus?

Martinus Beijerinck

Edward Jenner

Louis Pasteur

Robert Hooke

34. The protein coat of a virus is called:

Capsid

Envelope

Membrane

Core

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

Capsid

Episome

Provirus

Plasmid

36. The shape of a bacteriophage resembles:

Sphere

Lunar lander or tadpole

Rod

Coil

37. Viruses multiply by:

Fragmentation

Binary fission

Budding

Host-directed replication

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

Lipid membrane

Protein

Cellulose

Peptidoglycan

39. Why are viruses considered obligate parasites?

They are cellular

They are photosynthetic

They require a host to reproduce

They live independently

40. The core of a virus contains:

Ribosomes

Cytoplasm

Mitochondria

DNA or RNA

41. Which virus leads to the disease AIDS?

HIV

HSV

HBV

HPV

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

Capsid

RNA

Envelope proteins

Enzymes

43. How is viral RNA replicated in host cells?

By sunlight

By host cell enzymes

By virus itself

It does not replicate

44. Viruses are considered living when they:

Are in air

Are inside host cells

Are in crystalline form

Are in water

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

Measles

Hepatitis B

HIV

Common cold

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

Enzymes

Ribosomes

Peptones

Capsomeres

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

Ligase

DNA polymerase

Reverse transcriptase

RNA polymerase

48. The genetic material of a virus can be:

Only DNA

Either DNA or RNA, but not both

Only RNA

Both DNA and RNA in the same virus

49. Which of the following best describes HIV?

RNA virus with reverse transcriptase

Non-infectious virus

DNA virus

Plant virus

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Mustansar KhanLast Updated: October 14, 2025

Biology Biodiversity Test Online MCQs

Important Biodiversity Question and Answer

Biodiversity Practice Test Online With Explanation

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