Looking for classes? Ksquare Career Institute, Bengaluru →
Which one out of A – D given below correctly represents the structural formula of the basic amino acid?
A
B
B
C
C
D
D
A
Detailed Solution
A basic amino acid has an extra amino group in its side chain.
D is lysine, $H_2N-CH(COOH)-(CH_2)_4-NH_2$, which has a second $-NH_2$ group at the end of its side chain, so it is basic.
A is glutamic acid (acidic, extra –COOH), B is serine (neutral, –OH group) and C is not an amino acid at all (it has no –COOH group).
D is lysine, $H_2N-CH(COOH)-(CH_2)_4-NH_2$, which has a second $-NH_2$ group at the end of its side chain, so it is basic.
A is glutamic acid (acidic, extra –COOH), B is serine (neutral, –OH group) and C is not an amino acid at all (it has no –COOH group).