Assertion: Solubilities of proteins is minimum at the isoelectronic point.
Reason: At isoelectronic point , protein molecules behaves as a zwitter ion.

Options

A. If both assertion and reason are true and the reason is the correct explanation of the assertion.
B. If both assertion and reason are true but reason is not the correct explanation of the assertion.
C. If assertion is true but reason is false.
D. If the assertion and reason both are false.

Answer

A

Explanation

At some pH , an amino acid exists as electrically balanced Zwitter ion or dipolar ion. This is called iso – electric point. The solubility of protein is minimum at this point because the zwitter ions do not tend to ionize further in aqueous solution.