MCQ Collection
MDCAT Biology MCQs
Practice MDCAT Biology questions with answers and explanations.
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Correct Answer: C. DNA formed by joining sequences from different sources
Explanation:
Restriction enzymes and ligase can assemble recombinant molecules.
The DNA may then be introduced into a host cell.
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Correct Answer: D. DNA formed by joining sequences from different sources
Explanation:
Restriction enzymes and ligase can assemble recombinant molecules.
The DNA may then be introduced into a host cell.
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Correct Answer: A. A small DNA molecule used to carry foreign DNA into a cell
Explanation:
Plasmids replicate independently in many bacteria.
Engineered plasmids include selection markers and cloning sites.
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Correct Answer: B. A small DNA molecule used to carry foreign DNA into a cell
Explanation:
Plasmids replicate independently in many bacteria.
Engineered plasmids include selection markers and cloning sites.
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Correct Answer: C. A small DNA molecule used to carry foreign DNA into a cell
Explanation:
Plasmids replicate independently in many bacteria.
Engineered plasmids include selection markers and cloning sites.
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.
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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.
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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.
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Correct Answer: A. 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: A. Structures with similar function but different evolutionary origin
Explanation:
Analogous structures often arise through convergent evolution.
Bird and insect wings are examples.
