Gene mutations

Gene mutations Quiz

Spec 3.4.3 · AQA A-Level Biology: Quiz

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5 questions, one answer each

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  1. 1. Which describes a base deletion?

    • A. One base is replaced by another
    • B. One base is lost, shifting the bases into different triplets
    • C. A whole chromosome is lost
    • D. An extra base is added at the end of the gene

  2. 2. The mRNA codon CCU changes to CCC and both code for proline. Why is the polypeptide unchanged?

    • A. The code is universal
    • B. The code is non-overlapping
    • C. The code is degenerate
    • D. A stop codon was formed

  3. 3. Which term describes ultraviolet radiation increasing the mutation rate?

    • A. Mutagenic agent
    • B. Locus
    • C. Template
    • D. Non-disjunction

  4. 4. A gamete with 24 chromosomes fuses with a normal human gamete. How many chromosomes does the zygote have?

    • A. 46
    • B. 48
    • C. 47
    • D. 23

  5. 5. Which mutation is most likely to change many amino acids in a polypeptide?

    • A. Substitution in the third base of a codon
    • B. Substitution that changes UUC to UUU
    • C. A change that leaves a codon coding for the same amino acid
    • D. Deletion of a base near the start of the gene

Quiz