Which of following functional groups commonly found on organic molecules in the human body carries a positive charge (+1)at the pH of most body fluids?
A)sulfhydryl
B)phosphate
C)carboxyl
D)ester
E)amino

Question

Quizplus · Accepted Answer

The amino group (-NH2) is the functional group that commonly carries a positive charge at physiological pH. It acts as a base and can accept a proton (H+) to form an ammonium ion with a positive charge (+NH3) in acidic conditions. In most body fluids, the pH is around 7.4, which is slightly basic, and the amino group will be in its uncharged form (-NH3+) but still has the potential to become positively charged if the pH becomes more acidic.

Which of Following Functional Groups Commonly Found on Organic Molecules