Multiple Choice
In the context of the lipid bilayer, which structure is most directly responsible for maintaining cellular homeostasis by regulating what enters and leaves the cell?
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8. Membrane Structure
The Lipid Bilayer
Multiple Choice
In the context of the lipid bilayer, what is the primary function of carbohydrates attached to membrane lipids and proteins on the extracellular surface?
A
They form the hydrophobic core of the membrane that prevents ion leakage.
B
They mediate cell-cell recognition and adhesion and can act as identification tags for signaling.
C
They actively transport ions across the membrane by hydrolyzing ATP.
D
They serve as the main structural filaments that maintain cell shape from within the cytoplasm.
Verified step by step guidance1
Identify the location of carbohydrates attached to membrane lipids and proteins, which is on the extracellular surface of the lipid bilayer.
Understand the general roles of membrane components: lipids form the hydrophobic core, proteins can transport molecules or provide structure, and carbohydrates often have roles in recognition and signaling.
Recall that carbohydrates on the extracellular surface do not form the hydrophobic core; instead, they extend outward from the membrane and interact with the external environment.
Recognize that these carbohydrates function primarily in cell-cell recognition and adhesion, acting as identification tags that help cells communicate and respond to their surroundings.
Conclude that the primary function of these carbohydrates is to mediate cell-cell recognition and adhesion, rather than ion transport or structural support inside the cell.
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