A tetrapeptide is made of naturally occurring | vedclass

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(D) tetrapeptide is composed of four distinct amino acids: alanine,serine,glycine,and valine.Given that the $C$-terminal amino acid is fixed as alanin

Vedclass · Accepted Answer

$4$

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(D) tetrapeptide is composed of four distinct amino acids: alanine,serine,glycine,and valine.Given that the $C$-terminal amino acid is fixed as alanine,the remaining three positions ($N$-terminal,second,and third) must be filled by the remaining three amino acids: serine,glycine,and valine.The $N$-terminal amino acid must be chiral. Among the three available amino acids (serine,glycine,and valine),glycine is achiral,while serine and valine are chiral.Therefore,the $N$-terminal position can only be occupied by either serine or valine.Case $1$: If the $N$-terminal is valine,the remaining two positions (second and third) can be filled by serine and glycine in $2! = 2$ ways (Val-Ser-Gly-Ala and Val-Gly-Ser-Ala).Case $2$: If the $N$-terminal is serine,the remaining two positions (second and third) can be filled by valine and glycine in $2! = 2$ ways (Ser-Val-Gly-Ala and Ser-Gly-Val-Ala).Total number of possible sequences = $2 + 2 = 4$.

$A$ tetrapeptide is made of naturally occurring alanine,serine,glycine,and valine. If the $C$-terminal amino acid is alanine and the $N$-terminal amino acid is chiral,the number of possible sequences of the tetrapeptide is $....$

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