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

1–2 weeks

Immediate symptoms

2–4 months

Several years

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

Capsid proteins or envelope glycoproteins

Enzyme content

DNA

RNA

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

Jenner

Louis Pasteur

Dmitri Ivanovsky

Hershey

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

Viral protein only

Viral genome

Complete, infectious virus particle

Viral toxin

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

RNA polymerase

Reverse transcriptase

Ligase

DNA polymerase

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6. Which structure is shared by all viruses?

Ribosomes

Protein coat

Cell wall

Mitochondria

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7. Why are viruses considered obligate parasites?

They live independently

They are cellular

They require a host to reproduce

They are photosynthetic

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8. 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

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9. Which virus affects the liver?

Polio virus

Herpes

HIV

Hepatitis virus

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

Edward Jenner

Luc Montagnier

Jonas Salk

Louis Pasteur

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11. How is viral RNA replicated in host cells?

By host cell enzymes

It does not replicate

By virus itself

By sunlight

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

Double-stranded RNA

Double-stranded DNA

Single-stranded DNA

Single-stranded RNA

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

AIDS

Rabies

Common cold

Hepatitis B

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

Enzymes

Nucleic acid

Cell wall

Protein coat

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15. Viruses are classified on the basis of:

Number of ribosomes

Type of nucleic acid

Shape and size only

Color

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16. The AIDS virus primarily targets:

Helper T-cells

Red blood cells

Platelets

B-cells

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

Bacteria

Algae

Fungi

Virus

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18. Which virus was the first to be crystallized?

Polio virus

Influenza virus

AIDS virus

Tobacco mosaic virus

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19. Viruses multiply by:

Budding

Host-directed replication

Fragmentation

Binary fission

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20. Which enzyme do viruses lack?

Helicase

Reverse transcriptase

RNA polymerase

Ribosomes

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21. A virus cannot reproduce unless it:

Absorbs sunlight

Is inside a host cell

Has nutrients

Is in water

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22. Which type of virus causes the common cold?

Rabies virus

Rhinovirus

HIV

Influenza virus

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

RNA

Enzymes

Envelope proteins

Capsid

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24. The protein coat of a virus is called:

Membrane

Envelope

Capsid

Core

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

Enzymes

Ribosomes

Capsomeres

Peptones

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

Measles

Chickenpox

Mumps

Tetanus

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27. Who discovered the first virus?

Martinus Beijerinck

Louis Pasteur

Edward Jenner

Robert Hooke

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28. The function of reverse transcriptase is to:

Convert RNA into DNA

Convert protein into DNA

Replicate DNA

Convert DNA into RNA

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29. Viruses that infect plants are usually:

RNA viruses

Retroviruses

DNA viruses

Bacteriophages

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

Measles

AIDS

Dengue

Polio

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

Episome

Provirus

Plasmid

Capsid

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

Lipid membrane

Protein

Cellulose

Peptidoglycan

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33. Viruses are inactive:

Outside a host cell

At high temperatures

In acidic medium

In the presence of light

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

HIV

Polio virus

Influenza virus

Herpes simplex virus

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35. How are viruses different from bacteria?

Bacteria are acellular

Viruses need a host to replicate

Viruses have nuclei

Bacteria can’t reproduce

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36. Which of the following best describes a virus?

Non-living chemical

Acellular infectious agent

Prokaryotic organism

Living cell

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37. Which virus infects bacteria?

Baculovirus

Orthomyxovirus

Bacteriophage

Retrovirus

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

Hepatitis B

Measles

HIV

Common cold

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39. Which viral disease is sexually transmitted?

Rabies

Dengue

AIDS

Influenza

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40. Viruses can be seen with:

Light microscope

Compound microscope

Electron microscope

Dissecting microscope

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41. The shape of a bacteriophage resembles:

Lunar lander or tadpole

Rod

Sphere

Coil

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42. Which virus leads to the disease AIDS?

HSV

HIV

HBV

HPV

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43. Viruses are considered living when they:

Are inside host cells

Are in water

Are in air

Are in crystalline form

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44. Which type of virus causes cervical cancer?

HSV

HPV

HIV

HTLV

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45. The core of a virus contains:

Ribosomes

DNA or RNA

Cytoplasm

Mitochondria

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46. Which of the following best describes HIV?

DNA virus

Plant virus

RNA virus with reverse transcriptase

Non-infectious virus

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47. What shape is the tobacco mosaic virus?

Complex

Helical

Spherical

Icosahedral

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

Contaminated food

Insect bites

Air

Sexual contact and blood

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

Measles

Tuberculosis

Influenza

Hepatitis

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