Which of the Following Is True of Amino Acids That

Multiple Choice

Which of the following is true of amino acids that are dissolved in water?

A) They exist in an un-ionized form at high pH.
B) They exist in an un-ionized form at low pH.
C) They exist in an un-ionized form only at a specific pH.
D) They do not exist in an un-ionized form at any pH.