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14 January, 19:26

A normal polypeptide includes the following sequence of amino acids (Note:Each amino acid is named by a three-letter abbreviation.)

Iso-Leu-Pro-Val-His-Ser-Thr-Met

After a mutation, the amino acid sequence becomes the following:

Iso-Leu-Pro-Val-Tyr-Arg-Iso-Gly

Which of the following changes to a nitrogenous base in mRNA is most likely to have occured?

a. A cytosine (C) was replaced with uracil (U).

b. A uracil (U) was replaced with a thymine (T)

c. An adenine (A) was removed and not replaced

d. The codon ACU was removed and not replaced

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Answers (1)
  1. 14 January, 22:02
    0
    C

    Explanation:

    The mutation seen is most likely due to a frameshift mutation. A nucleotide was added or removed without replacement. This shifted the codon reading sequence by one nucleotide. Therefore the codon downstream of the mutation will code for different amino acids.
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