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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. Which virus was the first to be crystallized?

Polio virus

AIDS virus

Influenza virus

Tobacco mosaic virus

2. A virus cannot reproduce unless it:

Absorbs sunlight

Is in water

Has nutrients

Is inside a host cell

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

1–2 weeks

Several years

2–4 months

Immediate symptoms

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

Capsid

RNA

Enzymes

Envelope proteins

5. Which viral disease is sexually transmitted?

Influenza

AIDS

Rabies

Dengue

6. Viruses are inactive:

In acidic medium

Outside a host cell

At high temperatures

In the presence of light

7. How are viruses different from bacteria?

Viruses have nuclei

Bacteria are acellular

Viruses need a host to replicate

Bacteria can’t reproduce

8. The function of reverse transcriptase is to:

Replicate DNA

Convert DNA into RNA

Convert protein into DNA

Convert RNA into DNA

9. Which structure is shared by all viruses?

Protein coat

Ribosomes

Mitochondria

Cell wall

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

Viral toxin

Complete, infectious virus particle

Viral genome

Viral protein only

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

Capsomeres

Ribosomes

Peptones

Enzymes

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

AIDS

Common cold

Rabies

Hepatitis B

13. Viruses multiply by:

Binary fission

Host-directed replication

Fragmentation

Budding

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

Chickenpox

Measles

Tetanus

Mumps

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

Fungi

Virus

Algae

Bacteria

16. Which type of virus causes cervical cancer?

HPV

HTLV

HIV

HSV

17. The genetic material of a virus can be:

Both DNA and RNA in the same virus

Either DNA or RNA, but not both

Only RNA

Only DNA

18. Why are viruses considered obligate parasites?

They require a host to reproduce

They are photosynthetic

They are cellular

They live independently

19. Viruses that infect plants are usually:

RNA viruses

Retroviruses

DNA viruses

Bacteriophages

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

Episome

Provirus

Plasmid

Capsid

21. The AIDS virus primarily targets:

Helper T-cells

Red blood cells

B-cells

Platelets

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

AIDS

Polio

Measles

Dengue

23. Which type of virus causes the common cold?

HIV

Rabies virus

Influenza virus

Rhinovirus

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

Enzymes

Cell wall

Nucleic acid

Protein coat

25. Which enzyme do viruses lack?

Helicase

Ribosomes

Reverse transcriptase

RNA polymerase

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26. The shape of a bacteriophage resembles:

Sphere

Rod

Coil

Lunar lander or tadpole

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

Herpes simplex virus

HIV

Influenza virus

Polio virus

28. Viruses are considered living when they:

Are in water

Are inside host cells

Are in air

Are in crystalline form

29. Which of the following best describes HIV?

DNA virus

Plant virus

Non-infectious virus

RNA virus with reverse transcriptase

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

Jonas Salk

Edward Jenner

Louis Pasteur

Luc Montagnier

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

Cellulose

Lipid membrane

Peptidoglycan

Protein

32. Viruses can be seen with:

Light microscope

Electron microscope

Dissecting microscope

Compound microscope

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

HIV

Common cold

Measles

Hepatitis B

34. Which of the following best describes a virus?

Living cell

Non-living chemical

Prokaryotic organism

Acellular infectious agent

35. Which virus infects bacteria?

Baculovirus

Orthomyxovirus

Retrovirus

Bacteriophage

36. Who discovered the first virus?

Edward Jenner

Louis Pasteur

Robert Hooke

Martinus Beijerinck

37. The core of a virus contains:

Mitochondria

Cytoplasm

Ribosomes

DNA or RNA

38. Which virus leads to the disease AIDS?

HBV

HPV

HSV

HIV

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

Jenner

Dmitri Ivanovsky

Louis Pasteur

Hershey

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

RNA

Enzyme content

DNA

Capsid proteins or envelope glycoproteins

41. Which virus affects the liver?

Herpes

HIV

Hepatitis virus

Polio virus

42. Viruses are classified on the basis of:

Color

Type of nucleic acid

Number of ribosomes

Shape and size only

43. How is viral RNA replicated in host cells?

It does not replicate

By sunlight

By host cell enzymes

By virus itself

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

Reverse transcriptase

DNA polymerase

Ligase

RNA polymerase

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

Sexual contact and blood

Insect bites

Contaminated food

Air

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

Double-stranded RNA

Single-stranded RNA

Double-stranded DNA

Single-stranded DNA

47. What shape is the tobacco mosaic virus?

Complex

Spherical

Icosahedral

Helical

48. The protein coat of a virus is called:

Core

Envelope

Membrane

Capsid

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

Influenza

Hepatitis

Tuberculosis

Measles

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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

Uncategorized

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Mustansar Khan

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