Which of the following is not an amino acids_____________________?
Correct answer: B. lactic acid
- A. glumatic acid
- B. lactic acid
- C. aspartic acids
- D. glycine
Explanation
Amino acids contain both an amino group and a carboxyl group, while lactic acid contains a hydroxyl group and a carboxyl group but no amino group. Glutamic acid, aspartic acid and glycine are all amino acids, so lactic acid is the exception. Students may choose glutamic acid because its name resembles glucose or glutamine, but it is an acidic amino acid.
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About Classification of Proteins
Proteins are classified by composition as simple, conjugated and derived proteins, and by shape as fibrous or globular proteins. The topic relates these classes to examples such as albumin, keratin, collagen, haemoglobin and casein, while distinguishing structural proteins from proteins with transport, catalytic or regulatory roles.
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