Protein Structure (medium)

Which of the proteins below consists of 2 domains?

• Protein (a) only

• Protein (b) only

• Protein (c) only

• Proteins (a) and (b)

• Proteins (b) and (c)

Which of the amino acids listed below forms a covalent bond with its own aliphatic side chain C and α-N?

• Histidine

• Proline

• Asparagine

• Tryptophan

• Arginine

Which of the amino acids listed below contains an imidazole ring in its side chain?

• Histidine

• Proline

• Asparagine

• Tryptophan

• Arginine

Which of the amino acids listed below contains a branched side chain?

• Aspartate

• Lysine

• Valine

• Tyrosine

• Serine

Which of the 20 common amino acids does NOT exhibit chirality?

• Glycine

• Alanine

• Serine

• Leucine

• None – they all do

What type of covalent bonds are responsible for holding together the primary structure of proteins?

• Disulfide bonds

• Hydrogen bonds

• Peptide or amide bonds

• Ionic bonds

• None of the above

What type of non-covalent bonds are responsible for holding together the secondary structure of proteins?

• Disulfide bonds

• Hydrogen bonds

• Peptide or amide bonds

• Ionic bonds

• None of the above

What type of covalent bonds are responsible for holding together the tertiary structure of proteins?

• Disulfide bonds

• Hydrogen bonds

• Peptide or amide bonds

• Ionic bonds

• None of the above

Which of the following is NOT an element of protein secondary structure?

• Alpha helix

• Peptide bond

• Beta sheet

• Polypeptide loop

Which of the following could be expected to form an ion pair in protein tertiary structure?

• Ser + Cys

• Glu + Arg

• Pro + Lys

• Tyr + Met