MCQ Collection
MDCAT Biology MCQs
Practice MDCAT Biology questions with answers and explanations.
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Correct Answer: C. Reproduction involving fusion of gametes
Explanation:
Sexual reproduction combines genetic material from two gametes.
It increases genetic variation.
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Correct Answer: C. A response that amplifies an initial change
Explanation:
Positive feedback drives a process toward completion.
Examples include blood clotting and labor contractions.
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Correct Answer: D. Sister chromatids
Explanation:
Meiosis II resembles mitosis.
Centromeres divide and chromatids separate.
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Correct Answer: A. Sister chromatids
Explanation:
Meiosis II resembles mitosis.
Centromeres divide and chromatids separate.
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Correct Answer: B. Sister chromatids
Explanation:
Meiosis II resembles mitosis.
Centromeres divide and chromatids separate.
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Correct Answer: C. A cell with one set of chromosomes
Explanation:
Gametes are usually haploid.
Their fusion restores the diploid state.
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Correct Answer: D. A cell with one set of chromosomes
Explanation:
Gametes are usually haploid.
Their fusion restores the diploid state.
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Correct Answer: A. A cell with one set of chromosomes
Explanation:
Gametes are usually haploid.
Their fusion restores the diploid state.
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Correct Answer: B. A cell with two sets of chromosomes
Explanation:
Diploid cells contain homologous chromosome pairs.
Most human body cells are diploid.
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Correct Answer: C. A cell with two sets of chromosomes
Explanation:
Diploid cells contain homologous chromosome pairs.
Most human body cells are diploid.
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Correct Answer: D. A cell with two sets of chromosomes
Explanation:
Diploid cells contain homologous chromosome pairs.
Most human body cells are diploid.
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Correct Answer: A. Homologous chromosomes pair and crossing over may occur
Explanation:
Synapsis forms homologous pairs called bivalents.
Crossing over exchanges DNA between nonsister chromatids.
