The figure shows a hypothetical tetrapeptide | vedclass

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(A) By analyzing the structure of the tetrapeptide:$1$. The amino acid at position $a$ has a side chain $-CH_2OH$,which corresponds to Serine.$2$. The

Vedclass · Accepted Answer

$d$ is the acidic amino acid glutamic acid.

Vedclass · Answer

(A) By analyzing the structure of the tetrapeptide:$1$. The amino acid at position $a$ has a side chain $-CH_2OH$,which corresponds to Serine.$2$. The amino acid at position $b$ has a side chain $-CH_2SH$,which corresponds to Cysteine.$3$. The amino acid at position $c$ has a side chain $-CH_2-C_6H_5$ (phenylalanine derivative),which is an aromatic amino acid,but not Tryptophan.$4$. The amino acid at position $d$ has a side chain $-CH_2-CH_2-CH_2-COOH$,which corresponds to Glutamic acid.$5$. In a polypeptide chain,the $N$-terminal is on the left and the $C$-terminal is on the right. Thus,$a$ is the $N$-terminal and $d$ is the $C$-terminal.$6$. Option $a$ is incorrect because while $d$ is Glutamic acid,it is not the only correct statement if others are wrong,but looking at the options,none of the specific claims in $a, b, c$ are fully accurate except for the identification of $d$ as Glutamic acid. However,since $d$ is indeed Glutamic acid,option $a$ is the correct choice.

The figure shows a hypothetical tetrapeptide portion of a protein with parts labelled $a$ to $d$. Which one of the following options is correct?

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