Multiple Choice
In the context of the lipid bilayer, where is cholesterol primarily located within the plasma membrane?
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8. Membrane Structure
The Lipid Bilayer
Multiple Choice
In the context of the lipid bilayer, what is the primary purpose of cholesterol in the cell membrane?
A
To modulate membrane fluidity and stability across temperature changes
B
To serve as the main energy-storage molecule embedded in the membrane for ATP production
C
To provide the main structural framework of the membrane by forming long cytoskeletal filaments
D
To act as the primary transporter responsible for moving ions directly across the membrane
Verified step by step guidance1
Step 1: Understand the structure of the cell membrane, which is primarily composed of a phospholipid bilayer with embedded proteins and other molecules such as cholesterol.
Step 2: Recognize that cholesterol is a lipid molecule interspersed within the phospholipid bilayer, influencing the physical properties of the membrane.
Step 3: Recall that cholesterol's role is not to serve as an energy-storage molecule or to form cytoskeletal filaments, nor does it directly transport ions across the membrane.
Step 4: Focus on cholesterol's ability to modulate membrane fluidity by preventing the fatty acid chains of phospholipids from packing too closely in cold temperatures and restraining their movement in warm temperatures, thus maintaining membrane stability.
Step 5: Conclude that the primary purpose of cholesterol in the cell membrane is to regulate membrane fluidity and stability across temperature changes, ensuring proper membrane function.
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