18. Amino Acids and Proteins

Determine whether each of the following statements describes the primary, secondary, tertiary, or quaternary structure of a protein.

b. Peptide bonds join amino acids in a polypeptide chain.

Determine whether each of the following statements describes the primary, secondary, tertiary, or quaternary structure of a protein.

d. Hydrogen bonding between amino acids in the same polypeptide gives a coiled shape to the protein.

Determine whether each of the following statements describes the primary, secondary, tertiary, or quaternary structure of a protein.

b. Hydrogen bonds form between adjacent segments of the backbone of the same protein to form a “folded-fan” structure.

Determine whether each of the following statements describes the primary, secondary, tertiary, or quaternary structure of a protein.

d. Amino acids react in a condensation reaction to form a peptide bond.

Insulin is a protein hormone that functions as two polypeptide chains whose amino acid sequences are as follows:

A chain: GIVEQCCTSICSLTQLENYCN

B chain: FVNQHLCGDHLVEALYLV CGERGFFYTPKT

b. Considering the amino acid sequences, suggest how these two polypeptide chains might be held together in an active insulin molecule.

Explain how a protein is denatured by the following:

c. Organic solvents

For each of the conjugated proteins described, identify to which class of conjugated protein it belongs.

b. Ionized zinc is attached to this protein so the protein can function.

For each of the conjugated proteins described, identify to which class of conjugated protein it belongs.

c. Phosphate groups are attached to this protein.