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Câu hỏi: Amino axit nào sau đây có mạch cacbon phân nhánh?
A. Alanin.
B. Lysin.
C. Valin.
D. Glyxin.
A. Alanin.
B. Lysin.
C. Valin.
D. Glyxin.
Alanin: $\begin{aligned}
& C{{H}_{3}}-CH-COOH \\
& \text{ }\overset{|}{\mathop{N{{H}_{2}}}} \\
\end{aligned}$
Lysin: $\begin{aligned}
& {{H}_{2}}N-{{\left( C{{H}_{2}} \right)}_{4}}-CH-COOH \\
& \text{ }\overset{|}{\mathop{N{{H}_{2}}}} \\
\end{aligned}$
Valin: $\begin{aligned}
& C{{H}_{3}}-CH-CH-COOH \\
& \text{ }\overset{|}{\mathop{C{{H}_{3}}}} \overset{|}{\mathop{N{{H}_{2}}}} \\
\end{aligned}$
Glyxin: ${{H}_{2}}N-C{{H}_{2}}-COOH$
& C{{H}_{3}}-CH-COOH \\
& \text{ }\overset{|}{\mathop{N{{H}_{2}}}} \\
\end{aligned}$
Lysin: $\begin{aligned}
& {{H}_{2}}N-{{\left( C{{H}_{2}} \right)}_{4}}-CH-COOH \\
& \text{ }\overset{|}{\mathop{N{{H}_{2}}}} \\
\end{aligned}$
Valin: $\begin{aligned}
& C{{H}_{3}}-CH-CH-COOH \\
& \text{ }\overset{|}{\mathop{C{{H}_{3}}}} \overset{|}{\mathop{N{{H}_{2}}}} \\
\end{aligned}$
Glyxin: ${{H}_{2}}N-C{{H}_{2}}-COOH$
Đáp án C.