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MDCAT Biology Biodiversity Test Online

Mustansar KhanLast Updated: May 27, 2025

MDCAT Biology Biodiversity Test

MDCAT Biology Biodiversity Chaper Online Test

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:	MDCAT Entry Test Biology Online Test Interview Questions about Biology All Universities Entrance Test Recruitments Tests

MDCAT Biology Biodiversity MCQS Online Test

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1. The AIDS virus primarily targets:

Platelets

B-cells

Helper T-cells

Red blood cells

2. Which enzyme do viruses lack?

RNA polymerase

Helicase

Ribosomes

Reverse transcriptase

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

Complete, infectious virus particle

Viral protein only

Viral genome

Viral toxin

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

Tuberculosis

Hepatitis

Measles

Influenza

5. Viruses that infect plants are usually:

DNA viruses

RNA viruses

Retroviruses

Bacteriophages

6. Which of the following best describes HIV?

Plant virus

DNA virus

Non-infectious virus

RNA virus with reverse transcriptase

7. Which of the following best describes a virus?

Living cell

Acellular infectious agent

Non-living chemical

Prokaryotic organism

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

HIV

Common cold

Measles

Hepatitis B

9. What shape is the tobacco mosaic virus?

Spherical

Complex

Icosahedral

Helical

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

Sexual contact and blood

Air

Contaminated food

Insect bites

11. The shape of a bacteriophage resembles:

Sphere

Coil

Lunar lander or tadpole

Rod

12. Who discovered the first virus?

Robert Hooke

Louis Pasteur

Martinus Beijerinck

Edward Jenner

13. The protein coat of a virus is called:

Envelope

Membrane

Core

Capsid

14. The core of a virus contains:

Ribosomes

Mitochondria

Cytoplasm

DNA or RNA

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

Enzymes

Capsomeres

Peptones

Ribosomes

16. A virus cannot reproduce unless it:

Absorbs sunlight

Is in water

Has nutrients

Is inside a host cell

17. Viruses are classified on the basis of:

Shape and size only

Type of nucleic acid

Number of ribosomes

Color

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

Measles

Tetanus

Chickenpox

Mumps

19. Viruses multiply by:

Fragmentation

Binary fission

Host-directed replication

Budding

20. Which virus was the first to be crystallized?

Tobacco mosaic virus

Polio virus

AIDS virus

Influenza virus

21. Which type of virus causes the common cold?

Rhinovirus

Influenza virus

Rabies virus

HIV

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

2–4 months

Several years

Immediate symptoms

1–2 weeks

23. Viruses are inactive:

In acidic medium

At high temperatures

Outside a host cell

In the presence of light

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

Louis Pasteur

Hershey

Jenner

Dmitri Ivanovsky

25. Which type of virus causes cervical cancer?

HIV

HPV

HTLV

HSV

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

RNA

Capsid

Envelope proteins

Enzymes

27. Which virus infects bacteria?

Retrovirus

Orthomyxovirus

Baculovirus

Bacteriophage

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

Influenza virus

Herpes simplex virus

HIV

Polio virus

29. The function of reverse transcriptase is to:

Convert RNA into DNA

Replicate DNA

Convert DNA into RNA

Convert protein into DNA

30. The genetic material of a virus can be:

Only DNA

Only RNA

Either DNA or RNA, but not both

Both DNA and RNA in the same virus

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

Lipid membrane

Protein

Peptidoglycan

Cellulose

32. How are viruses different from bacteria?

Bacteria can’t reproduce

Viruses need a host to replicate

Viruses have nuclei

Bacteria are acellular

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

DNA

Enzyme content

Capsid proteins or envelope glycoproteins

RNA

34. Which virus leads to the disease AIDS?

HIV

HSV

HBV

HPV

35. Which structure is shared by all viruses?

Mitochondria

Ribosomes

Protein coat

Cell wall

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

Single-stranded DNA

Double-stranded DNA

Single-stranded RNA

Double-stranded RNA

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

Cell wall

Nucleic acid

Protein coat

Enzymes

38. Which virus affects the liver?

Polio virus

HIV

Hepatitis virus

Herpes

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

Dengue

Measles

Polio

AIDS

40. Why are viruses considered obligate parasites?

They are cellular

They are photosynthetic

They require a host to reproduce

They live independently

41. Viruses are considered living when they:

Are inside host cells

Are in crystalline form

Are in air

Are in water

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

RNA polymerase

Reverse transcriptase

Ligase

DNA polymerase

43. Which viral disease is sexually transmitted?

Dengue

Rabies

Influenza

AIDS

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

Luc Montagnier

Jonas Salk

Edward Jenner

Louis Pasteur

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

Rabies

Common cold

Hepatitis B

AIDS

46. How is viral RNA replicated in host cells?

By virus itself

By host cell enzymes

By sunlight

It does not replicate

47. Viruses can be seen with:

Compound microscope

Dissecting microscope

Electron microscope

Light microscope

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

Episome

Provirus

Capsid

Plasmid

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

Fungi

Bacteria

Virus

Algae

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Mustansar KhanLast Updated: May 27, 2025

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MDCAT Biology Biodiversity Test Online

MDCAT Biology Biodiversity Test

MDCAT Biology Biodiversity Chaper Online Test

MDCAT Biology Biodiversity MCQS Online Test

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Mustansar Khan

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MDCAT Biology Biodiversity Test

MDCAT Biology Biodiversity Chaper Online Test

MDCAT Biology Biodiversity MCQS Online Test

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Mustansar Khan

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