Amino acids

Which of the following is an essential amino acid?

• Alanine

• Leucine

• Serine

• Glutamic acid

Which amino acid is non-chiral (achiral)?

• Glycine

• Valine

• Glycine

• Isoleucine

What groups do peptide bonds form between?

• Two carboxyl groups

• Amino group of one and carboxyl group of another

• Two amino groups

• Hydroxyl and amino groups

What type of reaction is the formation of a peptide bond?

• Hydrolysis

• Oxidation

• Condensation

• Phosphorylation

What property determines the polarity of an amino acid?

• Backbone

• Side chain (R group)

• Side chain (R group)

• Central carbon

Which amino acid is classified as acidic?

• Lysine

• Serine

• Glutamic acid

• Phenylalanine

How many essential amino acids are there for humans?

• 7

• 9

• 11

• 20

Which of the following amino acids is essential?

• Alanine

• Arginine

• Threonine

• Glycine

What method sequences amino acids from the N-terminal?

• Mass spectrometry

• Edman degradation

• Edman degradation

• NMR spectroscopy

What technique does the peptide mass use to determine the sequence?

• Edman degradation

• X-ray crystallography

• Mass spectrometry

• Gas chromatography