Which of the following statements about con transport of solutes across a membrane is correct?
a. cotransport proteins allow a single ATP-powered pump to drive the active transport of many different solutes
b. in cotransport, both solutes that are being transported are moving down their chemical gradients
c. The sodium-potassium pump is an example of a cotransport protein
d. cotransport involves the hydrolysis of ATP by the transporting protein
e. a cotransport protein is most c
Answer: a. cotransport proteins allow a single ATP-powered pump to drive the active transport of many different solutes
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Natural selection results in
a. adaptation. b. a mutation. c. a new species. d. genetic drift. e. stabilizing selection.
Serial repetition of segments is a defining characteristic of which worm phylum?
A) Flatworms B) Annelids C) Roundworms D) Segmentation is not a defining characteristic of any of the worm phyla.
R-plasmids are most likely acquired via. Check all that apply.
a. translation. b. transformation. c. bacterial conjugation. d. transduction.
A bunch of hormone molecules travel by one cell and have no effect but quickly stimulate the next cell. What did the second cell have that the first did not?
A) larger size B) dendrites C) a homeostatic response D) receptors for the hormone E) greater need for the hormone