Question

Valine is an essential amino acid, which means that it cannot be manufactured in the body and must be obtained through dietary sources. It is a branched-chain amino acid that works with the other two BCAAs (isoleucine & leucine) to promote normal growth, repair tissues, regulate blood sugar, and provide the body with energy.

Correct each of the three drawings below (i.e., add or remove lone pairs, charges, and atoms) to show valine at pH 1, pH 7, and pH 11. The pKa values for valine's ionizable groups are 2.29 for the –COOH group and 9.72 for the –NH3+ group.

N H н н -CH3 Нас I-Z: I

I KEEP GETTING PH 1 AND PH 7 WRONG WITH THESE ANSWERS

PH 1 PH 7

HаNо н -CH3 Hас IH3N о. н CHз Нс

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