The absorptive epithelia in the gut are considered "polarized" because _____
A) thick and thin filaments are present
B) they pump wastes into the lumen while pumping nutrients toward the blood
C) the colors seen on the top and bottom of the cells are different
D) they must fire action potentials to absorb most nutrients
E) the apical surface is different from the basal surface
Answer: E
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An atom X contains 14 protons, 13 electrons, and 12 neutrons, and atom Y contains 14 protons, 14 electrons, and 12
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Indicate whether the statement is true or false
Replication of DNA begins at a(n)
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