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6) The pI of the dipeptide GD is: (pKa 's amino terminal is 10, pKa carboxyl terminal is 2, pKa R chain of D is 4.00): a. 7.00 b. 4.00 c. 8.00 d. 3.00 e. 6.00

Answer :

Final answer:

The Isoelectronic Point (pI) of the dipeptide GD can be calculated as the average of the pKa values of the components forming the zwitterion. In this case, those are the R chain of D (pKa = 4) and the amino terminal (pKa = 10). Therefore, the pI of the dipeptide GD is 7.00.

Explanation:

The Isoelectronic Point (pI) of a dipeptide GD can be calculated knowing the pKa of the amino terminal, carboxyl terminal, and R chain of D. The pKa values given are: amino terminal = 10, carboxyl terminal = 2, R chain of D = 4.00. To determine the pI, we generally find the average of the two pKa values surrounding the zwitterion form (neutral form). In this case, the two pKa's are 4 (from the R chain of D) and 10 (from the amino terminal). Thus, the pI can be calculated as:

pI = (4 + 10) / 2 = 7.

Therefore, the pI of the dipeptide GD is 7.00.

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