Question: What is the primary structure of a protein?
Answer: The primary structure of a protein is the linear sequence of amino acids in the
polypeptide chain, held together by peptide bonds. It determines the protein's overall
structure and function.
Question: Name two types of secondary protein structures and the bonds that stabilize them.
Answer: α-helix: Stabilized by hydrogen bonds between the carbonyl oxygen of one amino
acid and the amide hydrogen four residues away.
β-sheet: Stabilized by hydrogen bonds between the carbonyl and amide groups of adjacent
polypeptide strands.
Question: What is the role of disulfide bonds in protein structure?
Answer: Disulfide bonds stabilize the tertiary and quaternary structure of proteins by forming
covalent linkages between the sulfur atoms of cysteine residues.
Which of the following amino acids is most likely to be found in the hydrophobic core of a
globular protein?
a) Serine
b) Arginine
c) Valine
d) Glutamate
Answer: c) Valine (a hydrophobic, nonpolar amino acid).
Which level of protein structure is affected by denaturation?
a) Primary structure
b) Secondary structure
Answer: The primary structure of a protein is the linear sequence of amino acids in the
polypeptide chain, held together by peptide bonds. It determines the protein's overall
structure and function.
Question: Name two types of secondary protein structures and the bonds that stabilize them.
Answer: α-helix: Stabilized by hydrogen bonds between the carbonyl oxygen of one amino
acid and the amide hydrogen four residues away.
β-sheet: Stabilized by hydrogen bonds between the carbonyl and amide groups of adjacent
polypeptide strands.
Question: What is the role of disulfide bonds in protein structure?
Answer: Disulfide bonds stabilize the tertiary and quaternary structure of proteins by forming
covalent linkages between the sulfur atoms of cysteine residues.
Which of the following amino acids is most likely to be found in the hydrophobic core of a
globular protein?
a) Serine
b) Arginine
c) Valine
d) Glutamate
Answer: c) Valine (a hydrophobic, nonpolar amino acid).
Which level of protein structure is affected by denaturation?
a) Primary structure
b) Secondary structure
