MCQ Collection
MDCAT Biology MCQs
Practice MDCAT Biology questions with answers and explanations.
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Correct Answer: B. Salivary amylase
Explanation:
Salivary amylase breaks starch into smaller carbohydrates.
Its activity decreases in the acidic stomach.
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Correct Answer: C. Salivary amylase
Explanation:
Salivary amylase breaks starch into smaller carbohydrates.
Its activity decreases in the acidic stomach.
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Correct Answer: D. Salivary amylase
Explanation:
Salivary amylase breaks starch into smaller carbohydrates.
Its activity decreases in the acidic stomach.
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Correct Answer: A. Pepsin
Explanation:
Pepsin works in acidic conditions.
It breaks proteins into shorter peptides.
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Correct Answer: B. Pepsin
Explanation:
Pepsin works in acidic conditions.
It breaks proteins into shorter peptides.
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Correct Answer: C. Pepsin
Explanation:
Pepsin works in acidic conditions.
It breaks proteins into shorter peptides.
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Correct Answer: D. Reproduction involving fusion of gametes
Explanation:
Sexual reproduction combines genetic material from two gametes.
It increases genetic variation.
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Correct Answer: D. 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: A. Reproduction involving fusion of gametes
Explanation:
Sexual reproduction combines genetic material from two gametes.
It increases genetic variation.
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Correct Answer: B. Fusion of haploid gametes to form a diploid zygote
Explanation:
Fertilization restores the diploid chromosome number.
The resulting zygote begins development.
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Correct Answer: C. Fusion of haploid gametes to form a diploid zygote
Explanation:
Fertilization restores the diploid chromosome number.
The resulting zygote begins development.
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Correct Answer: D. Fusion of haploid gametes to form a diploid zygote
Explanation:
Fertilization restores the diploid chromosome number.
The resulting zygote begins development.
