When proteins can acts as a buffer system, their -COOH groups can accept H⁺ in the presence of excess acid, and their NH₃ groups can release H⁺ in the presence of excess base.

Question

Quizplus · Accepted Answer

This is true. Proteins contain both acidic (COOH) and basic (NH3) functional groups. In acidic conditions, the –COOH groups accept H+ ions; in basic conditions, the –NH3+ groups release H+ ions, making proteins effective buffer systems.

When Proteins Can Acts as a Buffer System, Their -COOH