Which amino acid can be involved in special covalent "disulfide bridges" that, when present, help to stabilize the
tertiary and quaternary structure of proteins?
a. proline
b. alanine
c. leucine
d. cysteine
e. methionine
ANSWER: d
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Which statement below characterizes metabolic pathways?
a. They are a random sequences of reactions. b. They are always biosynthetic. c. They are always degradative. d. They are enzyme-mediated sequences of reactions. e. They are always linear reactions.
Proteolytic processing of eukaryotic proteins involves:a
removal of a portion of the polypeptide chain from an inactive precursor of the protein. b. the addition of one or more functional groups to a precursor protein. c. the removal of one or more functional groups from a precursor protein. d. removal of histones. e. removing the cap and tail of a newly synthesized protein
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Indicate whether the statement is true or false
Information obtained by Franklin from X-ray crystallography on DNA suggested that it is shaped like a
A. pleated sheet. B. hollow cylinder. C. ribbon. D. icosahedron. E. helix.