At the PH Found in Cells About 7

At the pH found in cells about 7.0) , what happens to the carboxyl group on an amino acid?

A) It acts as a base and gains a proton, giving it a positive charge.
B) It is oxidized and tends to act as an electron acceptor in redox reactions.
C) It remains neutral, like water, and does not have a charge.
D) It acts as an acid and loses a proton, giving it a negative charge.

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