Fewpal
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Amino acids excepting histidine are not good buffering agents in cell because 

(A) They exist as zwitter ions 

(B) Their pk and not in the physiological pH of a cell 

(C) Only Histidine has pk of its R group at 6.0 unlike the others which have at a different pH 

(D) None of these

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(C) Only Histidine has pk of its R group at 6.0 unlike the others which have at a different pH

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