The part of the amino acid that is always acidic is the Carboxyl functional group. The correct option is b.
What are amino acids?
Amino acids are the building blocks of proteins. Amino acids are made up of three components. They are the amino group, R group, and carboxyl group. There are 20 types of amino acids present in nature.
There are different types of amino acids. They are divided into two categories; essential and non-essential according to their presence of them in the body.
The amino group is the basic part, and the carboxyl group is the acidic part of the amino acid. The structure of the amino acid attached below easily shows three different groups.
Thus, the correct option is b. Carboxyl functional group, regarding the part of the amino acid that is always acidic.
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The question is incomplete. Your most probably incomplete question is given below:
a. Amino functional group.
b. Carboxyl functional group.
c. Side chain ("R group").
d.None of the above.
