In frogs, green skin is determined by gene B.The wild-type sequence of the 5′ end of the RNA-like strand of the entire first exon is shown below.The gene encodes an enzyme that functions to convert a brown compound into a green pigment in the skin.
5′ ACTCAAGCACAGGTCGCATAAATGTTCCTGTTATTTGG… 3′
The table of codons is provided here:
-Which are the first three amino acids encoded by the wild-type sequence of gene B?
A)N-Thr-Gln-Ala…
B)N-Pro-Asn-Asn…
C)N-Met-Phe-Leu…
D)N-Ser-Ser-Val…
E)The correct sequence is not shown here.

Question

In frogs, green skin is determined by gene B.The wild-type sequence of the 5′ end of the RNA-like strand of the entire first exon is shown below.The gene encodes an enzyme that functions to convert a brown compound into a green pigment in the skin.
5′ ACTCAAGCACAGGTCGCATAAATGTTCCTGTTATTTGG… 3′
The table of codons is provided here: 
-Which are the first three amino acids encoded by the wild-type sequence of gene B?
A)N-Thr-Gln-Ala… 
B)N-Pro-Asn-Asn… 
C)N-Met-Phe-Leu… 
D)N-Ser-Ser-Val… 
E)The correct sequence is not shown here.

Quizplus · Accepted Answer

The first amino acid encoded by any newly initiated protein in eukaryotes is methionine (Met), corresponding to the start codon AUG. The sequence N-Met-Phe-Leu… indicates the correct initiation of protein synthesis with methionine, followed by other amino acids, making option C the correct choice.

In Frogs, Green Skin Is Determined by Gene B