MCQ Collection
Pakistan MCQs
Practice Pakistan questions with answers and explanations.
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Correct Answer: C. 0.5 mol
Explanation:
Moles = mass ÷ molar mass = 16 ÷ 32.
The sample therefore contains 0.5 mol.
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Correct Answer: C. Kill infected or abnormal host cells
Explanation:
Cytotoxic T cells recognize specific antigens on cell surfaces.
They induce target-cell death.
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Correct Answer: D. Exposure to antigenic material to generate protective immune memory
Explanation:
Vaccines prepare adaptive immunity before natural exposure.
They reduce infection, severe disease, or transmission.
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Correct Answer: A. Exposure to antigenic material to generate protective immune memory
Explanation:
Vaccines prepare adaptive immunity before natural exposure.
They reduce infection, severe disease, or transmission.
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Correct Answer: B. Exposure to antigenic material to generate protective immune memory
Explanation:
Vaccines prepare adaptive immunity before natural exposure.
They reduce infection, severe disease, or transmission.
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Correct Answer: C. Temporary protection from transferred antibodies
Explanation:
Maternal antibodies and antibody injections provide passive immunity.
Protection is immediate but usually short-lived.
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Correct Answer: D. Temporary protection from transferred antibodies
Explanation:
Maternal antibodies and antibody injections provide passive immunity.
Protection is immediate but usually short-lived.
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Correct Answer: D. A viral genome integrates into or persists with host DNA before activation
Explanation:
The viral genome may be copied with the host chromosome.
It can later enter the lytic cycle.
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Correct Answer: D. Produce antibody responses and memory B cells
Explanation:
Activated B cells can become plasma cells.
Plasma cells secrete antibodies.
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Correct Answer: A. A noncellular infectious particle requiring a host cell to reproduce
Explanation:
Viruses contain genetic material inside a protein coat.
Some also possess a lipid envelope.
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Correct Answer: A. A viral genome integrates into or persists with host DNA before activation
Explanation:
The viral genome may be copied with the host chromosome.
It can later enter the lytic cycle.
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Correct Answer: A. Kill infected or abnormal host cells
Explanation:
Cytotoxic T cells recognize specific antigens on cell surfaces.
They induce target-cell death.
