The movement of substances from lower to higher concentration across a semipermeable membrane that must have a specific protein carrier and cell expenditure of energy is called

The movement of substances from lower to higher concentration across a semipermeable membrane that must have a specific protein carrier and cell expenditure of energy is called



A. facilitated diffusion.
B. diffusion.
C. active transport.
D. osmosis.
E. endocytosis.





Answer: C


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