PHGY 170 M3 Block 3
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32 Terms
What is the fluid-mosaic model?
A model describing the plasma membrane as a fluid phospholipid bilayer containing proteins and other molecules.
Why is the membrane described as fluid?
Many membrane components can move laterally within the bilayer.
Why is the membrane described as a mosaic?
It contains many different molecules embedded in the membrane.
Who proposed the original fluid-mosaic model?
Singer and Nicolson.
What forms the basic structure of the membrane?
The phospholipid bilayer.
Can membrane proteins move within the membrane?
Many can move laterally within the membrane.
What is membrane fluidity?
The ease with which membrane components move.
Why is membrane fluidity important?
It allows membranes to function properly.
How does temperature affect membrane fluidity?
Higher temperatures increase fluidity.
How do lower temperatures affect membrane fluidity?
They decrease fluidity.
How do unsaturated fatty acids affect membrane fluidity?
They increase fluidity.
Why do unsaturated fatty acids increase fluidity?
Their kinks prevent tight packing.
How do saturated fatty acids affect membrane fluidity?
They decrease fluidity.
Why do saturated fatty acids decrease fluidity?
They pack tightly together.
What role does cholesterol play in membrane fluidity?
It helps stabilize membrane fluidity.
How does cholesterol affect membranes at high temperatures?
It reduces excessive fluidity.
How does cholesterol affect membranes at low temperatures?
It prevents excessive rigidity.
What are membrane proteins?
Proteins embedded in or attached to the membrane.
What are integral membrane proteins?
Proteins embedded within the membrane.
What are peripheral membrane proteins?
Proteins attached to the membrane surface.
What is one function of membrane proteins?
Transport molecules across the membrane.
What is another function of membrane proteins?
Cell signaling.
What is another function of membrane proteins?
Structural support.
Why are membrane proteins important?
They allow the membrane to perform specialized functions.
Can phospholipids move within the membrane?
Yes.
What does membrane fluidity allow cells to do?
Adapt and function under changing conditions.
What would happen if membranes became too rigid?
Membrane function would be impaired.
What would happen if membranes became too fluid?
Membrane stability would be reduced.
Which fatty acids increase membrane fluidity?
Unsaturated fatty acids.
Which fatty acids decrease membrane fluidity?
Saturated fatty acids.
What molecule buffers changes in membrane fluidity?
Cholesterol.
Why is the fluid-mosaic model important?
It explains membrane structure and behavior.