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

Ligase

Reverse transcriptase

RNA polymerase

DNA polymerase

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2. Viruses are considered living when they:

Are inside host cells

Are in air

Are in crystalline form

Are in water

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3. Viruses can be seen with:

Dissecting microscope

Compound microscope

Electron microscope

Light microscope

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

Peptidoglycan

Cellulose

Protein

Lipid membrane

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

Protein coat

Nucleic acid

Cell wall

Enzymes

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

Algae

Fungi

Virus

Bacteria

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7. The core of a virus contains:

Mitochondria

DNA or RNA

Ribosomes

Cytoplasm

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8. Why are viruses considered obligate parasites?

They are cellular

They live independently

They are photosynthetic

They require a host to reproduce

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9. Which of the following best describes HIV?

Non-infectious virus

RNA virus with reverse transcriptase

Plant virus

DNA virus

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

Tuberculosis

Measles

Influenza

Hepatitis

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11. The AIDS virus primarily targets:

Helper T-cells

Red blood cells

B-cells

Platelets

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

Influenza virus

Herpes simplex virus

Polio virus

HIV

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

Dmitri Ivanovsky

Hershey

Louis Pasteur

Jenner

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14. The protein coat of a virus is called:

Core

Envelope

Capsid

Membrane

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

Mumps

Tetanus

Chickenpox

Measles

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

Hepatitis B

Common cold

HIV

Measles

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17. Viruses multiply by:

Binary fission

Budding

Host-directed replication

Fragmentation

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18. The shape of a bacteriophage resembles:

Lunar lander or tadpole

Coil

Sphere

Rod

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19. The genetic material of a virus can be:

Only RNA

Both DNA and RNA in the same virus

Only DNA

Either DNA or RNA, but not both

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20. Which virus infects bacteria?

Bacteriophage

Orthomyxovirus

Retrovirus

Baculovirus

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21. Which structure is shared by all viruses?

Cell wall

Protein coat

Ribosomes

Mitochondria

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22. Which virus leads to the disease AIDS?

HIV

HPV

HBV

HSV

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23. Which virus was the first to be crystallized?

AIDS virus

Tobacco mosaic virus

Influenza virus

Polio virus

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24. Viruses are classified on the basis of:

Number of ribosomes

Color

Shape and size only

Type of nucleic acid

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

Air

Insect bites

Contaminated food

Sexual contact and blood

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

Viral protein only

Viral toxin

Complete, infectious virus particle

Viral genome

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27. Which type of virus causes the common cold?

Rhinovirus

Rabies virus

Influenza virus

HIV

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

2–4 months

Immediate symptoms

Several years

1–2 weeks

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29. How is viral RNA replicated in host cells?

By sunlight

By host cell enzymes

It does not replicate

By virus itself

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30. Which type of virus causes cervical cancer?

HPV

HIV

HTLV

HSV

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31. The function of reverse transcriptase is to:

Convert RNA into DNA

Replicate DNA

Convert protein into DNA

Convert DNA into RNA

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

Measles

Dengue

AIDS

Polio

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33. Which of the following best describes a virus?

Prokaryotic organism

Living cell

Acellular infectious agent

Non-living chemical

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34. What shape is the tobacco mosaic virus?

Spherical

Icosahedral

Complex

Helical

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35. How are viruses different from bacteria?

Viruses need a host to replicate

Bacteria are acellular

Bacteria can’t reproduce

Viruses have nuclei

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36. A virus cannot reproduce unless it:

Has nutrients

Absorbs sunlight

Is in water

Is inside a host cell

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

Single-stranded RNA

Single-stranded DNA

Double-stranded RNA

Double-stranded DNA

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38. Which virus affects the liver?

Herpes

Hepatitis virus

HIV

Polio virus

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

Episome

Plasmid

Provirus

Capsid

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

DNA

Capsid proteins or envelope glycoproteins

RNA

Enzyme content

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41. Viruses that infect plants are usually:

RNA viruses

DNA viruses

Retroviruses

Bacteriophages

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42. Which enzyme do viruses lack?

Helicase

RNA polymerase

Reverse transcriptase

Ribosomes

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

Luc Montagnier

Louis Pasteur

Edward Jenner

Jonas Salk

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44. Who discovered the first virus?

Robert Hooke

Martinus Beijerinck

Louis Pasteur

Edward Jenner

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

Capsomeres

Enzymes

Peptones

Ribosomes

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

Common cold

Hepatitis B

Rabies

AIDS

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47. Which viral disease is sexually transmitted?

Dengue

Rabies

Influenza

AIDS

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

Envelope proteins

Capsid

RNA

Enzymes

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49. Viruses are inactive:

At high temperatures

In acidic medium

Outside a host cell

In the presence of light

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