Multiple Choice
In the context of the lipid bilayer, what is the primary role of cholesterol in animal cell membranes?
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8. Membrane Structure
The Lipid Bilayer
Multiple Choice
In the context of the lipid bilayer, which structure primarily controls what enters and leaves the cell?
A
The plasma (cell) membrane
B
The nucleolus
C
The Golgi apparatus
D
The cytoskeleton
Verified step by step guidance1
Understand the role of the lipid bilayer as the fundamental structure of the plasma membrane, which forms a barrier around the cell.
Recognize that the plasma (cell) membrane is selectively permeable, meaning it controls the movement of substances into and out of the cell.
Recall that the nucleolus is involved in ribosome production and does not regulate substance exchange across the cell boundary.
Know that the Golgi apparatus functions in modifying, sorting, and packaging proteins, not in controlling entry or exit of molecules at the cell surface.
Identify that the cytoskeleton provides structural support and shape to the cell but does not regulate molecular traffic across the membrane.
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