Question 24.3: Draw the structure of the dipeptide Ala-Ser....
Draw the structure of the dipeptide Ala-Ser.
STRATEGY
First, look up the names and structures of the two amino acids, Ala (alanine) and Ser (serine). Since alanine is N-terminal and serine is C-terminal, Ala-Ser must have an amide bond between the alanine -CO_{2}H \text{and the serine} -NH_{2}
Step-by-Step
\text{N terminal} \quad\quad \ \ O \quad\quad\quad\quad \ \ \ O \quad\quad \text{C terminal}\\ \quad\quad\quad\quad\quad\quad \ \ \ \ \ \parallel \quad\quad\quad\quad\quad \ \parallel\\\rightarrow \quad\quad H_{2}NCHC-NHCHCOH\quad\leftarrow \\ \quad\quad\quad\quad\quad \ \ | \quad\quad\quad\quad\quad| \\ \quad\quad\quad\quad\quad \ CH_{3} \quad\quad\quad \ CH_{2}OH \\ \quad\quad\quad\quad\quad\text{Alanine}\quad\quad\quad \text{Serine} \\ \quad\quad\quad\quad\quad\quad\quad\quad\text{Ala-Ser}
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