MCQ Collection
MDCAT 2026 MCQs
Practice MDCAT 2026 questions with answers and explanations.
Choose an option to check your answer.
Correct Answer: D. A method for amplifying a selected DNA sequence
Explanation:
PCR uses repeated cycles of denaturation, primer binding, and extension.
It can produce millions of copies of target DNA.
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Correct Answer: A. A method for amplifying a selected DNA sequence
Explanation:
PCR uses repeated cycles of denaturation, primer binding, and extension.
It can produce millions of copies of target DNA.
Choose an option to check your answer.
Correct Answer: B. A method for amplifying a selected DNA sequence
Explanation:
PCR uses repeated cycles of denaturation, primer binding, and extension.
It can produce millions of copies of target DNA.
Choose an option to check your answer.
Correct Answer: C. Separation of charged molecules by movement through a gel in an electric field
Explanation:
DNA fragments are separated mainly by size.
Smaller fragments usually move farther through the gel.
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Correct Answer: D. Separation of charged molecules by movement through a gel in an electric field
Explanation:
DNA fragments are separated mainly by size.
Smaller fragments usually move farther through the gel.
Choose an option to check your answer.
Correct Answer: A. Separation of charged molecules by movement through a gel in an electric field
Explanation:
DNA fragments are separated mainly by size.
Smaller fragments usually move farther through the gel.
Choose an option to check your answer.
Correct Answer: B. Formation of new species
Explanation:
Speciation requires divergence and reproductive isolation.
It may occur with or without geographic separation.
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Correct Answer: C. Formation of new species
Explanation:
Speciation requires divergence and reproductive isolation.
It may occur with or without geographic separation.
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Correct Answer: D. Barriers preventing gene exchange between populations
Explanation:
Isolation may act before or after fertilization.
It allows populations to evolve independently.
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Correct Answer: A. Barriers preventing gene exchange between populations
Explanation:
Isolation may act before or after fertilization.
It allows populations to evolve independently.
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Correct Answer: B. Barriers preventing gene exchange between populations
Explanation:
Isolation may act before or after fertilization.
It allows populations to evolve independently.
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Correct Answer: C. Speciation caused by geographic separation
Explanation:
A physical barrier reduces gene flow.
Separated populations may diverge into distinct species.
