Biomolecules Question 15
15. Which one out of A-D given below correctly respresents the structural formula of the basic amino acid [2012]
| A | B | $C$ | D |
| :—: | :—: | :—: | :—: |
| $NH_2$ | $NH_2$ | $CH_2 OH$ | $NH_2$ |
| $H-C-COOH$ | $H-C-COOH$ | $CH_2$ | $H-C-COOH$ |
| $C_2$ | $CH_2$ | $\stackrel{C}{C} H_2$ | $CH_2$ |
| $CH_2$ | $OH$ | $NH_2$ | $CH_2$ |
| $OH$ | | | $CH_2$ |
| | | | $NH_2$ |
(a) $C$
(b) $D$
(c) $A$
(d) $B$
Show Answer
Answer : b
Hints & Solutions
(b) It is structural formula of basic amino acid lysine. Lysine is an $\alpha$-amino acid that is used in the biosynthesis of proteins. It contains an $\alpha$-amino group, an $\alpha$-carboxylic acid group, and a side chain lysyl, classifying it as a basic, charged, aliphatic amino acid. It is encoded by the codons AAA and AAG. Lysine is an amino acid (building block of protein). People use it to make medicine. Lysine is used for preventing and treating cold sores (caused by the virus called herpes simplex labialis).
