A)is a covalent bond between the carboxyl carbon of one amino acid and the amino nitrogen of a second amino acid. B)is a covalent bond between the functional R groups of adjacent amino acids. C)is a covalent bond between the NH group of one polypeptide and the CO group of an adjacent polypeptide that holds together multimeric proteins. D)is a noncovalent bond that dictates the tertiary structure of a protein. E)is a covalent bond between adjacent glucose molecules in a peptide.
You are researching a cytoplasmic protein associated with a nerve disorder.The native form of the enzyme appears to be globular protein; however,when a sample of the purified protein is treated with a chemical that reduces disulfide bonds,the enzymatic activity decreases dramatically and multiple globular proteins can be detected in the sample.What does this tell you about the protein?
A)The primary structure of the protein contains multiple cysteine residues that are hydrolyzed by the chemical reductant. B)The protein is most likely composed of multiple polypeptide chains that are held together by disulfide bonds. C)The protein is most likely composed of α helices that are held together by disulfide bonds. D)The protein is most likely composed of β sheets that are held together by disulfide bonds. E)The primary and secondary structure of the protein depends on disulfide bonds.