18 Questions
What effect does the addition of cholesterol have on animal cell membranes?
Decrease membrane permeability to water
How do cis-double bonds in phospholipids affect membrane fluidity at lower temperatures?
Increase fluidity
What is the impact of shorter hydrocarbon tails in phospholipids on membrane fluidity at lower temperatures?
Increase fluidity
Which factor decreases the mobility of phospholipid tails in the lipid bilayer?
Adding cholesterol
In terms of fluidity, what is the primary role of phospholipid tail length in the membrane?
Increase fluidity
How does the presence of cis-double bonds affect membrane fluidity?
Increase fluidity at higher temperatures
What is the primary function of liposomes?
Facilitate drug delivery into cells
In a phospholipid bilayer, which part of the phospholipid interacts with water?
Polar head group
Cell membrane fluidity is carefully regulated because it is important for which of the following?
Ensuring proper membrane function
What happens to phospholipids within each leaflet in terms of movement in a cell membrane?
They rapidly diffuse between leaflets
Which technique is used to manipulate the cell membrane without causing damage?
Laser tweezers
What structures can pure phospholipids form according to the text?
Closed, spherical liposomes
Why do enzymes in the ER membrane flip lipids from one leaflet to the other?
To maintain the asymmetry of the lipid bilayer
Which protein catalyzes rapid flip-flop of random phospholipids from one leaflet to the other?
Scramblase
What is the function of phospholipids synthesized in the cytosolic leaflet of the endoplasmic reticulum?
Maintain membrane asymmetry
What is the role of glycolipids in the lipid bilayer of an animal cell plasma membrane?
Signal transduction
How are phospholipids and glycolipids distributed in the lipid bilayer of an animal cell plasma membrane?
Unequally distributed in an organized manner
What property of membranes do glycoprotein membranes retain during transfer between cell compartments?
Membrane asymmetry
Explore the functions of membrane proteins in transportation, enzyme activity, and signaling, along with factors that influence membrane fluidity. Learn about the movement of membrane phospholipids within the lipid bilayer and how temperature and composition impact membrane properties.
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