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Cell membrane and cell transport
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16
Biology
Intermediate
11/13/2017

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Term
What is homeostasis?
Definition
A stable environment
Term
What type of cells have a cell membrane?
Definition
eukaryotic and prokaryotic cells
Term
What does it mean that the head is "polar"?
Definition
It means that this part is favorable of water
Term
What does it mean that the tails are "non-polar"?
Definition
It means that the part tries to stay away from water
Term
What kind of molecules can pass easily through the phospholipid bi-layer?
Definition
small non-polar molecules like oxygen gas
Term
How do molecules move through a cell?
Definition
low to high concentration
Term
In simple diffusion,molecules move from:
Definition
high concentration to low concentration
Term
What two molecules can easily pass through the phospholipid bilayer? ( cell membrane )
Definition
carbon dioxide and oxygen
Term
Diffusion is a type of
Definition
passive transport that does not require energy
Term
What are transport protiens and what do they do in the cell
Definition
a membrane protein that helps move substances across a cell membrane
Term
What is the job of a transport protien?
Definition
they help move things cross the cell membrane
Term
What kind of things do transport protiens move?
Definition
molecules that are too big to move through the cell membrane
Term
In facilitated diffusion, large molecules cannot pass across the cell membrane without the help of
Definition
proteins
Term
Why is facilitated diffusion a type of passive transport?
Definition
solutes move down the concentration gradient without using cellular energy
Term
_______ doesn't require a transport protien to cross the cell membrane
Definition
simple diffusion
Term
_________ does require a transport protein to cross the membrane
Definition
facilitated diffusion
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