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In presence of an acid, amino group can be ____________

(a) Polarized

(b) Washed away

(c) Protonated

(d) Replaced

I had been asked this question in a job interview.

This is a very interesting question from Chemical Basis of Life in section Chemical Basis of Life of Cell Biology

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The correct answer is (c) Protonated

Easiest explanation: In presence of an acid, amino group can be Protonated because an acid release proton, thereby increasing the hydrogen ion concentration in its vicinity and this can result in disruption of the protein activity to which amine group is attached.

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