Bio-Chemistry (M.Phil./Ph.D.) 2019 Panjab University Entrance Exam With Answers

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5.

The uncommon amino acid selenocysteine has an R group with the structure –CH2—SeH with a pKa of approximately 5. In an aqueous solution, pH=7.0, selenocysteine would:

A: Be fully ionized zwitterion with no net charge

B: Be nonionic

C: Never be found in a protein

D: Not be optically active

The answer is: A

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