In some icefish, the 3-amino acid AFGP repeat consists of thr-pro-ala. Thus, whe

Question

In some icefish, the 3-amino acid AFGP repeat consists of thr-pro-ala. Thus, when one consults a dictionary of the genetic code, one finds that all that is necessary to produce this version of the repeat, as opposed to the standard thr-ala-ala version, is a. a point substitution of C for G in the first base of the corresponding mRNA codon. b. third-base wobble involving U and A in the corresponding mRNA codon. c. a five-base insertion in the DNA. d. a point deletion resulting in the loss of a U from the corresponding mRNA codon.

Explanation / Answer

(A) Consulting a codon table shows that ala is coded by GCT and pro is coded by CCT. By substituting the C in the ala codon to G, you get pro.

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