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Standard XII

Biology

Amino Acids

The pKa value...

Question

The pKa values for the three groups P, Q, R are 4.3, 9.7 and 2.2 respectively. Calculate the isoelectric point of the amino acid rounded to the nearest integer.

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Solution

Since, it is an acidic group, the isoelectronic point will be equal to the average of the pKa of groups P and R (both acidic groups).

$p I = \frac{4.3 + 2.2}{2} = 3.25 = 3$ ( nearest integer).

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The pKa values for the three groups P, Q, R are 4.3, 9.7 and 2.2 respectively. Calculate the isoelectric point of the amino acid rounded to the nearest integer.

Since, it is an acidic group, the isoelectronic point will be equal to the average of the pKa of groups P and R (both acidic groups).pI=4.3+2.22=3.25=3 ( nearest integer).

Since, it is an acidic group, the isoelectronic point will be equal to the average of the pKa of groups P and R (both acidic groups).

$p I = \frac{4.3 + 2.2}{2} = 3.25 = 3$ ( nearest integer).