Amino Acids and Proteins Quiz

What are amino acids classified as according to the relative positions of the two functional groups?

• α

• β

• γ

• δ

What is the configuration of all naturally occurring α-amino acids?

• D-form

• L-form

• R-form

• S-form

What are neutral amino acids?

• Amino acids with one amino group and one carboxyl group

• Amino acids with two amino groups

• Amino acids with one carboxyl group

• Amino acids with no amino groups

What are essential amino acids?

• Amino acids that must be supplied through diet

• Amino acids that can be synthesized by the body

• Amino acids that are not required for metabolism

• Amino acids that are only found in plants

What is the isoelectric point (pI) of an amino acid?

• The pH at which the amino acid does not migrate

• The pH at which the amino acid is fully protonated

• The pH at which the amino acid is fully deprotonated

• The pH at which the amino acid is neutral

What is the method of preparation of α-amino acids that involves the conversion of an aldehyde?

• Strecker synthesis

• Gabriel's phthalimide synthesis

• Amidomalonate synthesis

• Erlenmeyer Azalactone synthesis

What is a peptide bond?

• Linkage formed by eliminating a molecule of water

• Linkage formed by adding a molecule of water

• Linkage formed by hydrogen bonding

• Linkage formed by ionic bonding

What is formed by eliminating a molecule of water between the carboxyl group of one amino acid and an α-amino group of another amino acid molecule?

• Dipeptide

• Tripeptide

• Polypeptide

• Amino acid

What is the bond length of the peptide C-N bond?

• 1.32 Å

• 1.47 Å

• 1.50 Å

• 1.60 Å

What is the method introduced by Merrifield for the synthesis of polypeptides?

• Solid phase peptide synthesis

• Liquid phase peptide synthesis

• Gas phase peptide synthesis

• None of the above