If glucose is the sole energy source, what fraction of the carbon dioxide exhaled by animals is generated by the reactions of the citric acid cycle?
A) 1/6
B) 1/3
C) 2/3
D) all of it
C
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The best explanation for why gene control is better understood in prokaryotes than in eukaryotes is
Endospores are
A. a dormant cell type. B. a form of reproduction. C. an obligate intracellular parasite. D. sensitive to damaging environmental conditions
What led to the increase in oxygen levels in the atmosphere on primitive Earth?
a. the first photosynthetic reactions b. photosynthetic cells that used water and not H2S as a source of electrons c. the development of cellular respiration pathways in cells d. the use of glycolysis in cells e. photosynthetic pathways that stripped oxygen off of carbon dioxide and retained only the carbon in subsequent steps
Beginning with an atom and working up to the entire planet, biologists view life as arranged from ________
A) small and simple to large and complex B) small and complex to large and simple C) large and complex to large and simple D) large and complex to small and simple