
To move a molecule into a cell against the concentration gradient requires energy.
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Q71: Phagocytosis is an example of passive transport.
Q72: Exocytosis is an example of active transport
Q73: Diffusion occurs because of random molecular movement.
Q74: Water moves freely through a semipermeable membrane.
Q75: Facilitated diffusion occurs through membrane-bound transport proteins.
Q77: Some integral proteins can span the entire
Q78: The phospholipid bilayer forms because fatty-acid tails
Q79: The _ functions in cell lubrication,adhesion,and signaling.
Q80: The plasma membrane proteins of a cell
Q81: What are two major differences between active
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