First slide

Proteins

Question

Glycyl alanine is correctly represented as

Moderate

A

$HOOC - {CH}_{2} - NH - CO - CH ({CH}_{3}) - {NH}_{2}$
B

$HOOC - CH ({CH}_{3}) - NH - CO - {CH}_{2} - {NH}_{2}$
C

$H_{2} N - {CH}_{2} - CO - NH - CH ({CH}_{3}) - COOH$
D

$H_{2} N - CH ({CH}_{3}) - CO - NH - {CH}_{2} - COOH$

Solution

The formula of a protein or poly peptide is written from N-terminal to C- terminal;
Thus glycyl alanine is represented as
$H_{2} N - {CH}_{2} - COOH (Gly) + H_{2} N - CH ({CH}_{3}) - COOH (Ala) \overset{- H_{2} O}{\to} H_{2} N - {CH}_{2} - CO - NH - CH ({CH}_{3}) - COOH$

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