MCQ Collection
MDCAT Biology MCQs
Practice MDCAT Biology questions with answers and explanations.
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Correct Answer: B. Cell division producing haploid gametes or spores
Explanation:
Meiosis includes two nuclear divisions after one DNA replication.
It reduces chromosome number and creates variation.
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Correct Answer: C. Cell division producing haploid gametes or spores
Explanation:
Meiosis includes two nuclear divisions after one DNA replication.
It reduces chromosome number and creates variation.
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Correct Answer: D. Four genetically varied haploid cells
Explanation:
Meiosis halves chromosome number.
Crossing over and independent assortment create variation.
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Correct Answer: A. An insertion or deletion that changes the reading frame
Explanation:
Frameshifts alter codon grouping downstream.
They often produce major changes in the protein.
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Correct Answer: A. Four genetically varied haploid cells
Explanation:
Meiosis halves chromosome number.
Crossing over and independent assortment create variation.
Choose an option to check your answer.
Correct Answer: B. An insertion or deletion that changes the reading frame
Explanation:
Frameshifts alter codon grouping downstream.
They often produce major changes in the protein.
Choose an option to check your answer.
Correct Answer: B. Four genetically varied haploid cells
Explanation:
Meiosis halves chromosome number.
Crossing over and independent assortment create variation.
Choose an option to check your answer.
Correct Answer: C. An insertion or deletion that changes the reading frame
Explanation:
Frameshifts alter codon grouping downstream.
They often produce major changes in the protein.
Choose an option to check your answer.
Correct Answer: C. Homologous chromosomes pair and crossing over may occur
Explanation:
Synapsis forms homologous pairs called bivalents.
Crossing over exchanges DNA between nonsister chromatids.
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Correct Answer: D. 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: D. Homologous chromosomes pair and crossing over may occur
Explanation:
Synapsis forms homologous pairs called bivalents.
Crossing over exchanges DNA between nonsister chromatids.
Choose an option to check your answer.
Correct Answer: A. 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.
