Which of the following marks the transition from
glycolysis to the Krebs cycle?
a. acetyl-CoA formation
b. conversion of PGAL to PGA
c. regeneration of reduced NAD+
d. oxidative phosphorylation
e. substrate-level phosphorylation
Answer: a
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A pathway that generates ATP by substrate-level phosphorylation that does not require oxygen and produces various end products, including alcohols, acids, carbon dioxide, and hydrogen, is:
a. substrate-level phosphorylation. b. fermentative metabolism. c. oxidative phosphorylation. d. aerobic respiration.
Which of the following is one of the properties of life?
a. membrane-bound organelles b. serendipity c. growth and development d. movement
Extracellular fluid includes
a. interstitial fluid. b. plasma. c. intracellular fluid. d. both a and b.
An activator protein would have which of the following effects on an operon with a positive control mechanism?
a. Stimulate transcription. b. Turn off transcription. c. Stimulate transcription when a coactivator is bound to the allosteric site. d. Inhibit transcription when a coactivator is bound to the allosteric site. e. Activator proteins only work on operons under negative control.