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'AP Biology Exam Review

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Deck Created: March 30, 2009
Last Updated: December 10, 2009  by: raining211
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Created by: robertdennison
Joined: 10/02/2008
Flashcards Created: 717
Flashcard Set Questions
41. What does the fluid-mosaic model depict?
a cell membrane made up of phospholipids and different types of proteins
42. What are transmembrane proteins?
proteins that span the entire width of a cell membrane
43. Lipid bilayers are selectively permeable....
Some substances can cross through the membrane more easily than other substances.
44. Membrane-forming lipids are amphipathic. ...
They contain both parts that are hydrophobic and hydrophilic.
45. In diffusion, substances tend to move alo...
They tend to move from an area of high concentration to an area of low concentration.
46. What is osmosis?
the process of the diffusion of water specifically through a selectively permeable membrane; note that the water is passing through special proteins called "aquaporins" which technically means osmosis is a type of facilitated diffusion.
47. What does it mean to say that a solution ...
The solution outside the cell membrane has a higher concentration of solutes than the interior. A higher concentration of solutes means it also has a lower concentration of water molecules. Therefore water moves from hypotonic to hypertonic. (see mnemonics)
49. What is an isotonic solution?
isotonic solutions have the same concentration of solutes and therefore they also have the same concentration of water molecules. Cells sitting in an isotonic solution will not change shape because water is entering and leaving at the same rate.
50. In reference to the lipid bilayer, where ...
on only one side of the membrane
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What does the fluid-mosaic model depict? a cell membrane made up of phospholipids and different types of proteins
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