MCQ Collection
Pakistan MCQs
Practice Pakistan questions with answers and explanations.
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Correct Answer: D. Stimulate protective immune memory without causing the full disease
Explanation:
Engineered antigens safely expose the immune system to a target.
Memory cells improve future responses.
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Correct Answer: D. Carbon dioxide and water
Explanation:
Organic reactions are predicted from functional groups, reagents and mechanisms.
The stated product or mechanism follows standard organic chemistry.
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Correct Answer: A. It hybridizes with a complementary target sequence
Explanation:
A labeled probe binds a matching nucleic-acid sequence.
Detection of the label reveals the target.
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Correct Answer: A. Free-radical substitution
Explanation:
Organic reactions are predicted from functional groups, reagents and mechanisms.
The stated product or mechanism follows standard organic chemistry.
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Correct Answer: B. It hybridizes with a complementary target sequence
Explanation:
A labeled probe binds a matching nucleic-acid sequence.
Detection of the label reveals the target.
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Correct Answer: B. Homolytic cleavage of Cl₂
Explanation:
Organic reactions are predicted from functional groups, reagents and mechanisms.
The stated product or mechanism follows standard organic chemistry.
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Correct Answer: C. It hybridizes with a complementary target sequence
Explanation:
A labeled probe binds a matching nucleic-acid sequence.
Detection of the label reveals the target.
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Correct Answer: C. Its π electrons are delocalized
Explanation:
Organic reactions are predicted from functional groups, reagents and mechanisms.
The stated product or mechanism follows standard organic chemistry.
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Correct Answer: D. They bind a single specific antigenic epitope
Explanation:
Identical antibody molecules have highly specific binding sites.
They can detect hormones, pathogens or disease markers.
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Correct Answer: D. Electrophilic aromatic substitution
Explanation:
Organic reactions are predicted from functional groups, reagents and mechanisms.
The stated product or mechanism follows standard organic chemistry.
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Correct Answer: A. Filter lymph and support immune responses
Explanation:
Lymph nodes trap foreign material and contain lymphocytes.
They monitor lymph returning from tissues.
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Correct Answer: B. Through lymphatic vessels
Explanation:
Lymphatic capillaries collect excess interstitial fluid.
Lymph eventually drains into large veins.
