The total number of isomeric linear dipeptide | vedclass

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Question

(D) Alanine is a chiral amino acid with one chiral center. $A$ racemic mixture contains both $(R)$ and $(S)$ enantiomers. When two alanine molecules c

Vedclass · Accepted Answer

$4$

Vedclass · Answer

(D) Alanine is a chiral amino acid with one chiral center. $A$ racemic mixture contains both $(R)$ and $(S)$ enantiomers. When two alanine molecules combine to form a linear dipeptide, the resulting molecule has two chiral centers (one from each alanine residue). Each chiral center can exist in either $(R)$ or $(S)$ configuration. The possible combinations for the two chiral centers in the dipeptide are $(R, R)$, $(R, S)$, $(S, R)$, and $(S, S)$. Since all these combinations represent distinct stereoisomers, there are $2^2 = 4$ possible isomeric linear dipeptides. Therefore, the total number of isomeric linear dipeptides is $4$, and the correct option is $(d)$.

List-$I$ Natural Amino acid	List-$II$ One Letter Code
$A$. Arginine	$I$. $D$
$B$. Aspartic acid	$II$. $N$
$C$. Asparagine	$III$. $A$
$D$. Alanine	$IV$. $R$

The total number of isomeric linear dipeptides which can be synthesised from racemic alanine is

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Match List-$I$ with List-$II$

List-$I$ Natural Amino acid List-$II$ One Letter Code

$A$. Arginine $I$. $D$

$B$. Aspartic acid $II$. $N$

$C$. Asparagine $III$. $A$

$D$. Alanine $IV$. $R$

Choose the correct answer from the options given below :-

Amino acids can be classified as $\alpha$,$\beta$,$\gamma$,$\delta$ and so on,depending upon the relative positions of the amino group with respect to the carboxyl group. Which type of amino acids form polypeptide chains in proteins?

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