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The plasma membrane is made up of a _________ bilayer, _______, and ___________.
phospholipid
proteins
carbohydrates
Check the nutrition facts.
The selective permeability of the cell membrane serves to manage the concentration of substances within the cell. Substances can cross the cell membrane by ________ ________, ________ _________, and _________ ___________.
passive transport
facilitated diffusion
active transport
pass, act, diffuse
What is Passive Transport?
During this, substances freely pass across the membrane without the cell expending any energy.
What is Facilitated Diffusion?
Facilitated diffusion does not require added energy but it cannot occur without the help of specialized proteins.
What is Active Transport?
Transport requiring energy output from the cell.
During this, substances freely pass across the membrane without the cell expending any energy.
Passive Transport
This does not require added energy but it cannot occur without the help of specialized proteins.
Facilitated Diffusion
_______ _________ requires energy output from the cell.
Active Transport