Amino Acids Quiz

How many amino acids occur in nature?

• 200

• 100

• 400

• 300

Which group or atom is attached to the alpha (α) carbon in each amino acid?

• Side chain or radical group (R)

• Carboxyl group (COOH)

• Amino group (NH2)

• Hydrogen atom (H)

At physiological pH, what is formed by the carboxyl group?

• No change

• Neutral molecule

• Positively charged ion NH3+

• Negatively charged carboxylate ion

Which amino acid is not actually an amino acid but an imino acid?

• Proline

• Glycine

• Alanine

• Serine

How are amino acids classified?

• None of the above

• Chemical, Nutritional, and Metabolic

• Physical, Biological, and Chemical

• Organic, Inorganic, and Synthetic

Which amino acid is derived from acetic acid?

• Glycine

• Tyrosine

• Alanine

• Phenylalanine

Which amino acid is derived from propionic acid?

• Alanine

• Serine

• Cysteine

• Tryptophan

Which amino acid is derived from butyric acid?

• Arginine

• Methionine

• Valine

• Threonine

Which amino acid is derived from isovaleric acid?

• Lysine

• Leucine

• Valine

• Histidine

Which amino acid is derived from caproic acid?

• Aspartate

• Leucine

• Histidine

• Lysine