Question

The $p{K}_a$ values for the three acidic group $P$,$Q$,$R$ are $4.3,9.7$ and $2.2$ respectively. The isoelectric point of the amino acid is:

• A. $3.25$
• B. $7$
• C. $6$
• D. $5.4$

Answer 1

The correct option is A $3.25$

The $p{K}_a$ values for the three acidic group $P,Q,R$ are $4.3,9.7$ and $2.2$ respectively.

The isoelectric point of the amino acid is $\frac{4.3+2.2}{2}=3.25$

So, the correct answer is $A$