MDCAT Biology Biodiversity Test Online MCQs

MDCAT Biology Biodiversity Test

Get exam-ready with this MDCAT Biology Biodiversity Online MCQ Test. This quiz focuses on key concepts such as levels of biodiversity, its importance, threats, and conservation strategies, aligned with the MDCAT 2025 syllabus to help you master this topic effectively.

MDCAT 2025 Biodiversity Online Test

Biodiversity MCQS Online Question with Answer

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1. The genetic material of a virus can be:

Either DNA or RNA, but not both

Both DNA and RNA in the same virus

Only RNA

Only DNA

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

Tuberculosis

Hepatitis

Measles

Influenza

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3. Who discovered the first virus?

Robert Hooke

Edward Jenner

Martinus Beijerinck

Louis Pasteur

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4. What shape is the tobacco mosaic virus?

Helical

Complex

Icosahedral

Spherical

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5. The function of reverse transcriptase is to:

Convert RNA into DNA

Replicate DNA

Convert DNA into RNA

Convert protein into DNA

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

Peptones

Capsomeres

Enzymes

Ribosomes

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7. Viruses that infect plants are usually:

RNA viruses

Retroviruses

Bacteriophages

DNA viruses

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8. Which type of virus causes cervical cancer?

HIV

HTLV

HSV

HPV

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

DNA polymerase

Reverse transcriptase

Ligase

RNA polymerase

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

Edward Jenner

Jonas Salk

Luc Montagnier

Louis Pasteur

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11. Which virus infects bacteria?

Retrovirus

Orthomyxovirus

Bacteriophage

Baculovirus

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

Sexual contact and blood

Air

Contaminated food

Insect bites

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

Single-stranded RNA

Double-stranded DNA

Double-stranded RNA

Single-stranded DNA

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14. A virus cannot reproduce unless it:

Absorbs sunlight

Is in water

Has nutrients

Is inside a host cell

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15. Which virus was the first to be crystallized?

Polio virus

Tobacco mosaic virus

Influenza virus

AIDS virus

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16. The protein coat of a virus is called:

Membrane

Capsid

Envelope

Core

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17. Which structure is shared by all viruses?

Cell wall

Protein coat

Mitochondria

Ribosomes

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

Cellulose

Peptidoglycan

Protein

Lipid membrane

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

Provirus

Episome

Capsid

Plasmid

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20. The AIDS virus primarily targets:

Red blood cells

Helper T-cells

B-cells

Platelets

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21. The shape of a bacteriophage resembles:

Sphere

Rod

Lunar lander or tadpole

Coil

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

Mumps

Chickenpox

Tetanus

Measles

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23. Which type of virus causes the common cold?

Rhinovirus

Influenza virus

HIV

Rabies virus

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24. Viruses multiply by:

Budding

Host-directed replication

Fragmentation

Binary fission

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

Protein coat

Enzymes

Cell wall

Nucleic acid

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

Dengue

AIDS

Measles

Polio

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

Common cold

AIDS

Rabies

Hepatitis B

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28. Why are viruses considered obligate parasites?

They are photosynthetic

They require a host to reproduce

They live independently

They are cellular

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29. Viruses are classified on the basis of:

Color

Shape and size only

Type of nucleic acid

Number of ribosomes

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30. Which viral disease is sexually transmitted?

Dengue

Rabies

AIDS

Influenza

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

Hershey

Dmitri Ivanovsky

Louis Pasteur

Jenner

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32. How are viruses different from bacteria?

Bacteria can’t reproduce

Bacteria are acellular

Viruses have nuclei

Viruses need a host to replicate

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

Viral genome

Viral toxin

Viral protein only

Complete, infectious virus particle

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34. Which virus leads to the disease AIDS?

HSV

HBV

HIV

HPV

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

Enzyme content

RNA

DNA

Capsid proteins or envelope glycoproteins

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

Virus

Bacteria

Algae

Fungi

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

1–2 weeks

Immediate symptoms

Several years

2–4 months

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38. Which of the following best describes HIV?

RNA virus with reverse transcriptase

Plant virus

Non-infectious virus

DNA virus

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39. Viruses can be seen with:

Compound microscope

Light microscope

Electron microscope

Dissecting microscope

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

Influenza virus

Herpes simplex virus

Polio virus

HIV

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41. The core of a virus contains:

DNA or RNA

Cytoplasm

Ribosomes

Mitochondria

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42. Viruses are inactive:

In acidic medium

In the presence of light

Outside a host cell

At high temperatures

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43. Which of the following best describes a virus?

Acellular infectious agent

Living cell

Non-living chemical

Prokaryotic organism

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

Measles

Common cold

HIV

Hepatitis B

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45. How is viral RNA replicated in host cells?

By sunlight

By host cell enzymes

By virus itself

It does not replicate

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46. Viruses are considered living when they:

Are inside host cells

Are in water

Are in crystalline form

Are in air

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47. Which enzyme do viruses lack?

Helicase

Reverse transcriptase

Ribosomes

RNA polymerase

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

Capsid

RNA

Enzymes

Envelope proteins

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49. Which virus affects the liver?

Hepatitis virus

HIV

Polio virus

Herpes

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