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AP bio Chapter 5-
questions on ap biology
28
Biology
11th Grade
09/07/2011

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Term
Which is said to enter a cell faster: lipid soluble molecules or water soluble molecules?
Definition
lipid soluble
Term
The name of the first membrane was the unit membrane model. What did this model describe?
Definition
proposed that proteins were embedded in an outer membrane and all cells had similar membrane structures
Term
How was the fluid mosaic membrane model different from the unit membrane model?
Definition
the unit membrane model suggested that there was an embedded protein in the outer membrane, the fluid mosaic model suggests that there are embedded proteins throughout the membrane in an irregular pattern and this varies with different membranes
Term
The plasma membrane is a ______with embedded proteins.
Definition
phospolipid layer
Term
Phospholipids have both hydrophobic and hydrophilic regions. Would nonpolar tails be hydrophobic or hydrophilic? polar tails?
Definition
nonpolar tails would be hydrophobic; polar tails would be hydrophilic
Term
Where are the polar and nonpolar molecules pointed in the membrane?
Definition
polar are pointed outward and nonpolar are pointed inward
Term
What kind of pattern to proteins form on the membrane?
Definition
mosaic
Term
______is a lipid found in animal plasma membranes.
Definition
cholesterol
Term
What is the purpose of cholestrol in a membrane?
Definition
it stiffens and strengthens the membrane
Term
_____have a similar structure to phospholipids.
Definition
glycolipids
Term
How do glycolipids differ from phospholipds?
Definition
the hydrophilic head in glycolipids is made of sugar
Term
What is the function of glycolipids in the membrane?
Definition
they are protective and assist in various proteins
Term
_____have an attached carbohydrate chain of sugar that projects externally.
Definition
glycoproteins
Term
in animal cells, what is the glycolax?
Definition
sugar coat of carbhodyrate chains
Term
How are cells unique?
Definition
they have slightly varied carbohydrate chains
Term
The ______recognizes foreign tissues that have inappropirate carbohydrate chains.
Definition
immune system
Term
_____are the basis for A, B, and O blood groups in humans.
Definition
carboydrate chains
Term
At body temperature, the phospholipid bilayer has the consistency of _____.
Definition
olive oil
Term
What causes more fluid in the bilayer?
Definition
greater concentration of unsaturated fatty acid residues
Term
Some proteins are held together by the ______.
Definition
cytoskeletal filaments
Term
How many proteins are in the red blood cell plasma membrane?
Definition
50 plus
Term
____deteremine most of the mebrane's functions.
Definition
membrane proteins
Term
What are the five types of integral proteins?
Definition
channel, carrier, cell recognition, receptor, enzymatic
Term
_____allow a particular molecule to cross a membrane freely.
Definition
channel proteins
Term
______selectively interact with a specific molecule so it can cross the plasma membrane.
Definition
carrier proteins
Term
______are glycoproteins that allow the body's immune system to recgonize the difference between foreign invaders and body cells.
Definition
cell recognition proteins
Term
_____are shaped so a specific molecule can bind to it.
Definition
receptor proteins
Term
_____carry out specific metabolic reactions
Definition
enzymatic
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