MCQ Collection
MDCAT 2026 MCQs
Practice MDCAT 2026 questions with answers and explanations.
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Correct Answer: D. 3.01e+23 particles
Explanation:
Number of particles = moles × Avogadro constant.
0.5 × 6.02×10²³ = 3.01e+23.
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Correct Answer: A. A polymer formed by repeated addition of unsaturated monomers
Explanation:
Addition polymerization opens double bonds without small-molecule byproducts.
Polyethene forms from ethene.
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Correct Answer: A. 9.03e+23 particles
Explanation:
Number of particles = moles × Avogadro constant.
1.5 × 6.02×10²³ = 9.03e+23.
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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: 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. 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: B. 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: C. A lipid membrane surrounding some viruses
Explanation:
Enveloped viruses acquire membrane from host cells.
Viral proteins embedded in it assist attachment and entry.
