MCQ Collection
MDCAT Biology MCQs
Practice MDCAT Biology questions with answers and explanations.
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Correct Answer: B. A DNA change that does not alter the encoded amino acid
Explanation:
The genetic code is redundant.
Different codons can specify the same amino acid.
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Correct Answer: C. Nuclear envelopes reform around separated chromosomes
Explanation:
Chromosomes reach the poles and decondense.
Two daughter nuclei are formed.
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Correct Answer: D. Nuclear envelopes reform around separated chromosomes
Explanation:
Chromosomes reach the poles and decondense.
Two daughter nuclei are formed.
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Correct Answer: A. Nuclear envelopes reform around separated chromosomes
Explanation:
Chromosomes reach the poles and decondense.
Two daughter nuclei are formed.
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Correct Answer: B. Division of the cytoplasm
Explanation:
Cytokinesis separates the parent cell into daughter cells.
Animal cells use a cleavage furrow, while plant cells form a cell plate.
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Correct Answer: C. Division of the cytoplasm
Explanation:
Cytokinesis separates the parent cell into daughter cells.
Animal cells use a cleavage furrow, while plant cells form a cell plate.
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Correct Answer: A. An allele whose effect is masked in a heterozygote
Explanation:
A recessive phenotype usually appears when no dominant allele is present.
The allele can still be transmitted by carriers.
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Correct Answer: A. A heritable change in genetic material
Explanation:
Mutations may alter one base, a gene, or chromosome structure.
They create genetic variation.
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Correct Answer: B. An allele whose effect is masked in a heterozygote
Explanation:
A recessive phenotype usually appears when no dominant allele is present.
The allele can still be transmitted by carriers.
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Correct Answer: B. A heritable change in genetic material
Explanation:
Mutations may alter one base, a gene, or chromosome structure.
They create genetic variation.
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Correct Answer: C. An allele whose effect is masked in a heterozygote
Explanation:
A recessive phenotype usually appears when no dominant allele is present.
The allele can still be transmitted by carriers.
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Correct Answer: C. A change affecting a single nucleotide pair
Explanation:
Point mutations include substitutions and small insertions or deletions.
Their effects vary with location and type.
