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Questions and Answers
What is the primary function of the hydrophobic core of the phospholipid bilayer?
What is the primary function of the hydrophobic core of the phospholipid bilayer?
- To facilitate the transport of hydrophilic ions and polar molecules
- To increase the permeability of the membrane
- To allow the passage of small hydrophobic molecules and gases only
- To block the diffusion of hydrophilic ions and polar molecules (correct)
What is the role of protein channels in the membrane?
What is the role of protein channels in the membrane?
- To regulate the temperature of the cell
- To facilitate the transport of molecules across the membrane (correct)
- To synthesize carbohydrates on the cell surface
- To provide structural support to the membrane
What is the purpose of carbohydrates on the cell surface?
What is the purpose of carbohydrates on the cell surface?
- To provide structural support to the membrane
- To act as signaling molecules or markers for cell-cell interactions (correct)
- To increase the permeability of the membrane
- To facilitate the transport of molecules across the membrane
What is the characteristic of the phospholipid bilayer that allows it to be semipermeable?
What is the characteristic of the phospholipid bilayer that allows it to be semipermeable?
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What is the term used to describe the flexibility of the phospholipid bilayer?
What is the term used to describe the flexibility of the phospholipid bilayer?
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Study Notes
Phospholipid Bilayer
- The phospholipid bilayer is the main structure of the cell membrane.
- The bilayer's structure makes the membrane semipermeable.
Selective Permeability
- The hydrophobic core of the bilayer blocks the diffusion of hydrophilic ions and polar molecules.
- Small hydrophobic molecules and gases can dissolve in the membrane's core and cross it easily.
Protein-Dependent Transport
- Some molecules require proteins to transport them across the membrane.
- Protein channels help the cell control what enters and leaves the cell.
Membrane Components
- The membrane contains carbohydrates that act as signaling molecules or markers.
- These components help the cell interact with its environment.
- All membrane components are suspended in the phospholipid bilayer, making it a fluid membrane.
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Description
Learn about the structure of the phospholipid bilayer and its role in regulating the transport of molecules in and out of the cell.
