Question 1

Which of the following best describes the principle of vaccination?

Accepted Answer

Administering an altered pathogen or its components to induce immunity without causing disease.

Question 2

Which type of immunity is produced when a person receives a vaccine and develops their own immune response?

Accepted Answer

Active immunity

Question 3

A patient receives an injection of antibodies after exposure to rabies. What type of immunity is this?

Accepted Answer

Passive immunity

Question 4

Which of the following is a major advantage of live-attenuated vaccines?

Accepted Answer

They elicit strong and persistent immune responses similar to natural infection.

Question 5

Which vaccine type is most likely to require multiple booster doses due to lower antigenic stimulation?

Accepted Answer

Inactivated (killed) vaccines

Question 6

A vaccine is developed using only the purified surface protein of a virus. Which type of vaccine is this?

Accepted Answer

Subunit vaccine

Question 7

Which of the following is a key property of an ideal vaccine?

Accepted Answer

It should induce a long-lasting immune response across a broad range of individuals.

Question 8

Why are adjuvants often added to subunit vaccines?

Accepted Answer

To boost the immune response by enhancing antigen presentation.

Question 9

Which of the following is a potential risk associated with live-attenuated vaccines?

Accepted Answer

They may revert to a virulent form and cause disease.

Question 10

A child with a severe egg allergy should avoid which type of vaccine due to risk of hypersensitivity?

Accepted Answer

Influenza vaccine produced in eggs

Question 11

Which of the following best explains the concept of herd immunity?

Accepted Answer

Protection of unvaccinated individuals due to high vaccination rates in the community.

Question 12

Which of the following is a disadvantage of polysaccharide-based vaccines?

Accepted Answer

They elicit serotype-specific, low-affinity antibody responses with no immunologic memory.

Question 13

Why are glycoconjugate vaccines more effective than plain polysaccharide vaccines?

Accepted Answer

They generate higher affinity antibodies and long-lived memory B cells.

Question 14

Which of the following statements about nucleic acid-based vaccines is correct?

Accepted Answer

They use DNA or mRNA to instruct cells to produce antigenic proteins.

Question 15

A booster dose of a vaccine is recommended when:

Accepted Answer

The antibody level drops below the protective threshold after the primary dose.

Question 16

Which of the following is a challenge specific to viral vector-based vaccines?

Accepted Answer

Pre-existing immunity to the vector can reduce vaccine efficacy.

Question 17

Which of the following is a contraindication for live-attenuated vaccines?

Accepted Answer

Immunocompromised status

Question 18

Which of the following best describes the role of memory cells in vaccination?

Accepted Answer

They allow for a faster and more effective response upon subsequent exposure to the same antigen.

Question 19

Which of the following controversies was associated with the MMR vaccine?

Accepted Answer

A fraudulent study falsely claimed a link between MMR vaccine and autism.

Question 20

Which of the following is a reason why thimerosal was removed from most childhood vaccines?

Accepted Answer

As a precautionary measure due to public concern, despite lack of evidence for harm.

Vaccines: Principles, Types, and Challenges – General Biology Study Notes

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