MCQ Collection
Pakistan MCQs
Practice Pakistan questions with answers and explanations.
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Correct Answer: C. Specific immunity that develops after exposure and can form memory
Explanation:
Adaptive immunity uses B and T lymphocytes.
Its memory produces faster secondary responses.
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Correct Answer: D. A lipid membrane surrounding some viruses
Explanation:
Enveloped viruses acquire membrane from host cells.
Viral proteins embedded in it assist attachment and entry.
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Correct Answer: D. A molecule recognized by the immune system
Explanation:
Antigens contain regions called epitopes.
They can trigger or bind specific immune receptors.
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Correct Answer: A. A virus that infects bacteria
Explanation:
Bacteriophages attach to specific bacterial hosts.
They may follow lytic or lysogenic life cycles.
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Correct Answer: A. A molecule recognized by the immune system
Explanation:
Antigens contain regions called epitopes.
They can trigger or bind specific immune receptors.
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Correct Answer: B. A virus that infects bacteria
Explanation:
Bacteriophages attach to specific bacterial hosts.
They may follow lytic or lysogenic life cycles.
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Correct Answer: B. A molecule recognized by the immune system
Explanation:
Antigens contain regions called epitopes.
They can trigger or bind specific immune receptors.
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Correct Answer: C. A virus that infects bacteria
Explanation:
Bacteriophages attach to specific bacterial hosts.
They may follow lytic or lysogenic life cycles.
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Correct Answer: C. A protein produced by B-cell descendants that binds a specific antigen
Explanation:
Antibodies can neutralize, opsonize, or activate complement.
Their binding sites are antigen-specific.
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Correct Answer: D. A viral cycle ending with host-cell lysis and virus release
Explanation:
Viral components are synthesized and assembled inside the host.
The host cell then breaks open.
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Correct Answer: D. A protein produced by B-cell descendants that binds a specific antigen
Explanation:
Antibodies can neutralize, opsonize, or activate complement.
Their binding sites are antigen-specific.
Choose an option to check your answer.
Correct Answer: A. A viral cycle ending with host-cell lysis and virus release
Explanation:
Viral components are synthesized and assembled inside the host.
The host cell then breaks open.
