Question

Which of these statements is not true regarding amino acids?

(a) The amino group is ionizable

(b) The acidic group is ionizable

(c) Structure remains same at different pH

(d) Glycine is the simplest amino acid

The question was posed to me in a national level competition.

This is a very interesting question from Biomolecules topic in portion Biomolecules of Biology – Class 11

Answer 1

The correct choice is (c) Structure remains same at different pH

Easiest explanation: The amino group and the acidic group or an amino acid are both ionizable and can exist in zwitter ionic form. However, due to their ionizable property, their structure does not always remain the same at different pH.