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) 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?
a. All of these choices are possible b. Through glycolysis and the Kreb's cycle where ATP is produced through substrate phosphorylation. c. Through lactic acid fermentation where the production of ATP is low, but fast. d. rough oxidative phosphorylation where the output of ATP energy is greatest
Microaerophiles are microbes that grow best at low
A) carbon dioxide levels. B) pH values. C) hydrostatic pressure. D) oxygen levels. E) salt concentrations.
Rank the elements carbon, sodium, calcium, and iodine in order of decreasing number of valence electrons
A. CNaCaI B. ICaNaC C. ICCaNa D. CCaNaI