review-questions-for-MCAT-OC-BC-pdf_pag184

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Bioorganic Chemistry  175
399. This is the structure of the amino acid isoleucine:
O
CH
CH CH3
CH2
CH3
OHH2N C
Which of the following is the zwitterion form of isoleucine?
(A) 
O
CH
CH CH3
CH2
CH3
OHH2N C
(B) 
O
CH
CH CH3
CH2
CH3
OH2N C
–
(C) 
O
CH
CH CH3
CH2
CH3
OHH3N C
+
(D) 
O
CH
CH CH3
CH2
CH3
OH3N C
+ –