Question

Lysine is an amino acid with a net positive charge. Whichfunctional

group is responsible for this net charge?

a) Carboxylic acid on alpha Carbon
b) Amine on Alpha Carbon
c) Amine on side chain
d) "a" and "b" are good.

Answer 1

C) Amine on Side Carbon

Step-by-step explanation:

Amino acids are the monomer units of the proteins which are considered one of the important biomolecules of an organism.

The structure of amino acid contains two functional groups called Carboxylic and amine group, an R side chain and hydrogen.

The two functional groups attached to the amino acid determines whether the amino acid will be acidic or basic.

Lysine is considered a basic amino acid that is it will have the net positive charge at neutral or lower pH due to the fact that when hydrogen ions are present in the solution, the amine group on the side chain donates its lone pair and attain positive charge that is become NH³⁺.

Thus, Option-C is the correct answer.