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cell biology - unit 1
ka 2 - transport across membranes
cell membrane
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lucy steven
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Cards (5)
what does the cell membrane consist of?
phospholipids
and
proteins
what is passive transport?
Movement of molecules across a
cell membrane
without the use of energy.
what is diffusion?
movement of molecules down a
concentration gradient
from a
high concentration
to a
low concentration
what is osmosis
movement of
water molecules
down a
concentration gradient
from a high water concentration to a low water concentration
what is active transport?
movement of
ions
against a
concentration gradient
from a low concentration to a high concentration, uses energy
