Amino acids usually exist in the form of Zwitter ions. This means that it consists of [KCET 2000]

• A.                 The basic group \[N{{H}_{2}}\] and the acidic group \[-COOH\]
• B.                 The basic group \[-NH_{3}^{+}\] and the acidic group \[-C{{O}_{2}}\]
• C.                 The basic group \[-CO_{2}^{-}\] and the acidic group \[NH_{3}^{+}\]
• D.                 No acidic or basic group