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Question 60

Find the iso-electric point of the given amino acid:

Screenshot 2026-09-01 10

For an acidic amino acid (like glutamic acid), the isoelectric point ($$pI$$) is calculated by taking the average of the two lowest $$\mathrm{p}K_a$$ values:

$$pI=\frac{pK_{a1}+pK_{aR}}{2}$$

Substituting the given values:

$$pI=\frac{2+4}{2}$$

$$pI=\frac{6}{2}=3$$

Correct option: (C)

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