A cell expends energy when moving substances against a gradient during ____
a. symport
b. passive diffusion
c. active transport
d. facilitated diffusion
e. antiport
ANSWER: c
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A. CNaCaI B. ICaNaC C. ICCaNa D. CCaNaI
What percentage of air is oxygen?
A) 79% B) 6% C) 12% D) 21% E) < 1%
A sprinter (very fast runner) can rapidly use up its store of ATP energy. How can one obtain ATP quickly?
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Microaerophiles are microbes that grow best at low
A) carbon dioxide levels. B) pH values. C) hydrostatic pressure. D) oxygen levels. E) salt concentrations.