Question

A. mine functional groups are fully protonated, and can be described with the chemical formula: N+H3.

Answer 1

Answer:

The correct statements are A amine groups are fully protonated and can be described with the chemical formula NH3+ B carboxylic acid functional groups are de protonated and can be be described with the chemical formula COO-  C Amine functional groups are positively.

Explanation:

If we study the biochemical structure of an amino acid we wil see that an amino group or -NH2 is present at one end and a carboxylic group or COOH is present at another end.

  Now the fact the that when an amino acid exist as zwitterion it contain same number of positive charge as well as same number of negative charge.So during zwitterion formation the carboxylic acid or -COOH liberates a proton and exist as COO- whereas the amine group accepts that proton and exist as NH3+.

  Beside this the amine group -NH2 after the formation of zwitterion gains a positive charge and exist as -NH3+.