During translation, which one of the following brings a charged tRNA into the A site of the ribosome?
a. tRNA synthetase
b. a translation initiation factor
c. translation elongation factor EF-Tu
d. translation elongation factor EF-G
Answer: c. translation elongation factor EF-Tu
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ATP is not generated directly in the citric acid cycle; instead, an intermediate is first generated by substrate-level phosphorylation. The intermediate is:
A. acetyl-CoA. B. GTP. C. GDP. D. cAMP. E. oxaloacetate.
In the Calvin cycle, the enzyme that catalyzes the capture of carbon dioxide and the formation of 3-phosphoglycerate is
A) phosphoglycerokinase. B) ribulose bisphosphate carboxylase/oxygenase (rubisco). C) triose phosphate isomerase. D) phosphoribulokinase. E) glyceraldehyde-3-phosphate dehydrogenase.
During stressful situations, epinephrine initiates all of the following actions except:a
constriction of the blood vessels to the skin. b. constriction of the blood vessels to the heart. c. dilation of the blood vessels to the brain. d. an increase in metabolic rate. e. an increase in blood glucose levels.
Which substance is a fossil fuel?
A) vegetable oil B) coal C) hydrogen gas D) wood