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7 terms

cells 3.2

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selectivly permeable
Some substances are allowed to pas through and others cannot. The cell membrane is this.
diffusion
Molecules move through the cell membrane from an area of higher concentration to lower concentration.
osmosis
WATER molocules use diffusion to move across a selectivly permeable cell membrane. (higher to lower concentration)
passive transport
When molecules are transported WITHOUT USING cellular energy.
active transport
When molecules are transported while USING cellular energy.
types of passive transport
osmosis and diffusion
types of active transport
carrier proteins and engulfing