Which of the following statements about disulfide bond formation is false?
(a) Disulfide bonds do not form under reducing environments.
(b) Disulfide bonding occurs by the oxidation of pairs of cysteine side chains on the protein.
(c) Disulfide bonding stabilizes the structure of proteins.
(d) Disulfide bonds form spontaneously within the ER because the lumen of the ER is oxidizing.
(d) An enzyme in the ER lumen catalyzes disulfide bond formation.
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One regulatory step in the process of gene expression and synthesis of proteins is the actual modification of proteins themselves, called ____ modification
Fill in the blank with the appropriate word.
Which of the following does NOT describe modern, living cells?
a. a semi-permeable membrane keeping the internal environment of the cell separate from the external environment b. nucleic acids linked in a sequence to form at least one large molecule c. a requirement for the nucleic acids to be contained behind a nuclear membrane d. multiple pathways for converting energy from one form into another e. a method of converting the nucleic acid sequences into proteins
The three periods of the Mesozoic era in sequence from most ancient to most recent are
A. Permian, Triassic, and Jurassic. B. Cretaceous, Jurassic, and Triassic. C. Silurian, Ordovician, and Cambrian. D. Triassic, Jurassic, and Cretaceous. E. Cambrian, Ordovician, and Silurian.
The process of fermentation is energetically more efficient than that of cellular respiration
Indicate whether the statement is true or false