Multiple Choice
Which statement about the lipid bilayer of the cell membrane is true?
20
views
8. Membrane Structure
The Lipid Bilayer
Multiple Choice
In the context of the lipid bilayer, what is a primary function of carbohydrates attached to membrane lipids and proteins?
A
They function primarily as transmembrane channels that allow polar solutes to diffuse through the membrane.
B
They form the hydrophobic core of the membrane and create the permeability barrier to ions.
C
They provide the ATP needed for active transport across the membrane by serving as the main energy source in the bilayer.
D
They act as cell-surface markers that mediate cell recognition and communication (e.g., in glycoproteins and glycolipids).
Verified step by step guidance1
Understand the structure of the lipid bilayer, which consists mainly of phospholipids forming a hydrophobic core that acts as a barrier to ions and polar molecules.
Recognize that carbohydrates attached to membrane lipids and proteins are found on the extracellular surface of the membrane, often as part of glycoproteins and glycolipids.
Recall the primary roles of these carbohydrate groups, which include acting as cell-surface markers that facilitate cell recognition, communication, and interaction with the environment.
Differentiate these functions from other membrane components: transmembrane proteins form channels for solute passage, and ATP is produced elsewhere in the cell, not by carbohydrates in the membrane.
Conclude that the main function of carbohydrates on membrane lipids and proteins is to serve as markers for cell recognition and communication, rather than forming channels, barriers, or energy sources.
Related Videos
Related Practice
