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Free Viruses MCQs with Answers

247 Viruses MCQs from Biology, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.

Viruses are acellular infectious particles made of genetic material enclosed by a protein capsid, sometimes with a lipid envelope. Their replication depends on a host cell and may follow lytic or lysogenic cycles, so viral structure and reproduction differ fundamentally from those of cellular organisms such as bacteria.

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247 questions · page 13 of 13

241. For defense against a virus attack, the body produces:

  • A. Antibodies
  • B. Histamines
  • C. Antigens
  • D. Interferons

Explanation: The correct answer is Interferons. Interferons are proteins produced by host cells in response to viral infections.

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Correct answer: Interferons

242. The common name of rubella is:

  • A. Whooping cough
  • B. German measles
  • C. African sleeping sickness
  • D. Tay Sach's Disease

Explanation: It is also called German measles, but it is caused by a different virus than measles.

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Correct answer: German measles

243. The genome of influenza virus is made up of _.

  • A. Single strand RNA
  • B. Double strand DNA
  • C. Single strand DNA
  • D. Double stranded RNA

Explanation: Influenza viruses, belonging to the Orthomyxoviridae family, have a segmented, negative-sense, single-stranded RNA genome.

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Correct answer: Single strand RNA

244. _ virus does not cause chronic liver disease.

  • A. Hepatitis C
  • B. Hepatitis B
  • C. Hepatitis A
  • D. Hepatitis A and B

Explanation: some viruses, such as hepatitis B and hepatitis C, can indeed cause chronic liver disease.

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Correct answer: Hepatitis A

245. Meristems are devoid of _ due to the absence of vascular system in them.

  • A. Bacteria
  • B. Algae
  • C. Fungus
  • D. Virus

Explanation: Meristems are devoid of viruses because they lack a vascular system. Since viruses require a host to replicate and spread, the absence of…

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Correct answer: Virus

246. The bacteriophage contains an enzyme called _ which digest the cell wall of bacterium.

  • A. Lysozyme
  • B. Hemagglutinin
  • C. Neuraminidae
  • D. Integrase

Explanation: The bacteriophage is a virus that infects bacteria. It uses an enzyme called lysozyme to break down the cell wall of the bacterium it…

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Correct answer: Lysozyme

247. The first scientifically approved vaccine was:

  • A. Oral Polio vaccine
  • B. Small Pox Vaccine
  • C. MMR Vaccine
  • D. Tetanus Vaccine

Explanation: The first scientifically approved vaccine was the smallpox vaccine. It was developed by Edward Jenner in the late 18th century.

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Correct answer: Small Pox Vaccine
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