Amino Acids

Which one of the following amino acid contains an imino group ?

(1987-TUS)

• Glycine

• Proline

• Valin

• Tyrosine

Which one of the following amino acid has a negative charge at physiological pH?

(TUS 2002)

• glutamic acid

• arginine

• alanine

• phenilalanine

Which one of the following amino acid is hydrophilic and has a basic side chain?

(TUS 2017)

• asparagine

• valine

• serin

• lysine

Why do extracellular proteins need to stabilize by disulfide bonds?

• to resist pH changing

• these are covalent bonds

• to keep intact protein in harsh conditions

• to communicate with other cells

What are the experimental importance of aromatic amino acids?

• they smells good

• their hydrophobic nature

• absorbing light

• ring side chain