MCQ Collection
MDCAT Biology MCQs
Practice MDCAT Biology questions with answers and explanations.
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Correct Answer: A. RNA polymerase
Explanation:
RNA polymerase binds near a gene and builds an RNA strand.
It uses complementary ribonucleotides.
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Correct Answer: B. DNA polymerase
Explanation:
DNA polymerase extends a new strand using a template.
It adds nucleotides in the 5′ to 3′ direction.
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Correct Answer: B. RNA polymerase
Explanation:
RNA polymerase binds near a gene and builds an RNA strand.
It uses complementary ribonucleotides.
Choose an option to check your answer.
Correct Answer: C. DNA polymerase
Explanation:
DNA polymerase extends a new strand using a template.
It adds nucleotides in the 5′ to 3′ direction.
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Correct Answer: C. Uracil
Explanation:
RNA uses uracil instead of thymine.
Uracil pairs with adenine.
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Correct Answer: D. DNA ligase
Explanation:
Ligase seals breaks in the sugar-phosphate backbone.
It creates a continuous lagging strand.
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Correct Answer: D. Uracil
Explanation:
RNA uses uracil instead of thymine.
Uracil pairs with adenine.
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Correct Answer: A. DNA ligase
Explanation:
Ligase seals breaks in the sugar-phosphate backbone.
It creates a continuous lagging strand.
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Correct Answer: B. DNA ligase
Explanation:
Ligase seals breaks in the sugar-phosphate backbone.
It creates a continuous lagging strand.
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Correct Answer: C. The DNA strand synthesized continuously toward the replication fork
Explanation:
DNA polymerase can follow the fork continuously on the leading template.
Synthesis still proceeds 5′ to 3′.
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Correct Answer: D. The DNA strand synthesized continuously toward the replication fork
Explanation:
DNA polymerase can follow the fork continuously on the leading template.
Synthesis still proceeds 5′ to 3′.
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Correct Answer: A. The DNA strand synthesized continuously toward the replication fork
Explanation:
DNA polymerase can follow the fork continuously on the leading template.
Synthesis still proceeds 5′ to 3′.
