Which statement best describes the activity of the sodium-potassium pump?
a. It transports hydrogen ions out of the cell.
b. It transports water directly out of the cell.
c. It transports 2 sodium ions into the cell in exchange for 3 potassium ions.
d. It transports 3 sodium ions out of the cell in exchange for 2 potassium ions.
e. It transports 2 sodium ions out of the cell in exchange for 2 potassium ions.
d
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As hominins diverged from other primates, which of the following appeared first?
A) reduced jawbones B) language C) bipedal locomotion D) the making of stone tools E) an enlarged brain
The oxidation of which macromolecule yields the most energy by weight?
a. lipids b. glycogen c. starch d. glucose e. protein
Which one of the following molecules would MOST likely require a transport protein to cross the plasma membrane of a red blood cell?
a. H2O b. CO2 c. O2 d. C6H12O6
In the soil, some ________ help to decompose dead organisms and other waste materials, returning vital chemical elements such as nitrogen to the environment
A) slime molds B) animals C) protozoans D) prokaryotes