At the pH found in cells (about 7.0),what happens to the amino group on an amino acid?
A)It acts as a base and gains a proton,giving it a positive charge.
B)It acts as an acid and loses a proton,giving it a negative charge.
C)It is reduced,and tends to act as an electron donor in redox reactions.
D)It remains neutral,like water,and does not have a charge.

Question

Quizplus · Accepted Answer

At a pH of 7.0, the amino group (-NH2) on an amino acid acts as a base and gains a proton (H+), giving it a positive charge (+NH3). This is because the pH is slightly acidic compared to the pKa of the amino group, which is around 9-10. As a result, the amino group is protonated and positively charged.

At the PH Found in Cells (About 7