Transport Proteins 1
Transport Proteins 2
Fluidity
Phospholipid bilayer
Transport/Gradients
100
What are the 3 types of membrane transport proteins?
Transmembrane Proteins
Lipid Anchored Proteins
Peripheral Membrane Proteins
100
What is the purpose of transport proteins?
Transport Proteins are transmembrane proteins that provide a passageway for the movement of ions and hydrophilic molecules across membranes
100
What are 3 factors that affect fluidity in the cell membrane?
Length of fatty acyl tails
Presence of double bonds
Presence of cholesterol
100
What molecules diffuse faster polar or non polar?
Nonpolar molecules diffuse faster
100
In passive transport molecules move from _____ concentrations to ___ concentrations?
high to low
200
Transmembrane Proteins are folded in what?
Alpha helices
200
Channel Transport Proteins use that kind of transport?
Passive transport
200
During High temperatures the fluidity of the cell membrane becomes what?
Too fluid, leaky cell membrane
200
Do small or big molecules diffuse faster?
Small molecules diffuse faster
200
What is osmosis?
Diffusion of H2O across a selectively permeable membrane
300
What is a lipid anchored protein?
Lipid molecules from membrane attached to amino acid chain of protein
300
What is an Antiporter?
Two or more ions or molecules transported in opposite directions
300
During low temperatures the fluidity of the cell membrane becomes what?
Too solid, nonfunctional membrane proteins
300
_________ movement of lipids within the cell membrane?
semi-fluid
300
What is passive transport?
diffusion ,Requires no energy
400
What are peripheral proteins bound by?
Hydrogen bond or ionic bonds
400
What two features allow transport proteins to move ions and molecules across the membrane?
Hydrophilic pocket and Conformational change
400
How does the presence of Cholesterol affect the fluidity of the cell membrane?
Cholesterol tends to stabilize the membrane
400
What does the rate of diffusion depend on?
Depends on the chemistry of solute and its concentration
400
What is a transmembrane gradient?
Concentration of a solute is higher on one side of a membrane than the other.
500
What are peripheral proteins bound to?
Transmembrane protein
500
What is an example of a channel transport protein?
aquaporins
500
How does the length of fatty acyl tails affect the fluidity of the cell membrane?
Shorter acyl tails are less likely to interact, making membrane more fluid
500
Draw a Phospholipid?
500
What is ion electrochemical gradient?
Both an electrical gradient and chemical gradient