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Questions and Answers
How does the amphipathic nature of lipids contribute to the formation of cell membranes in an aqueous environment?
How does the amphipathic nature of lipids contribute to the formation of cell membranes in an aqueous environment?
- The lipids form a monolayer with all the hydrophilic heads facing the water.
- The hydrophilic heads of the lipids face the water, while the hydrophobic tails cluster together in the membrane interior. (correct)
- The amphipathic nature has no effect; lipids arrange randomly in water.
- The hydrophobic tails of the lipids face the water, while the hydrophilic heads are buried in the membrane interior.
Which of the following is the primary role of glycoproteins and glycolipids in the cell membrane?
Which of the following is the primary role of glycoproteins and glycolipids in the cell membrane?
- To mediate cell-cell recognition and signaling. (correct)
- To facilitate the transport of large, polar molecules.
- To regulate the fluidity of the membrane.
- To provide structural support to the lipid bilayer.
A plant cell is placed in a hypertonic solution. What is the most likely outcome?
A plant cell is placed in a hypertonic solution. What is the most likely outcome?
- There will be no net change in the cell's condition.
- The cell will burst due to excessive water intake.
- The cell will undergo plasmolysis as water leaves. (correct)
- The cell will become turgid as water enters.
Why is active transport essential for maintaining cellular function?
Why is active transport essential for maintaining cellular function?
How do aquaporins affect the movement of water across cell membranes?
How do aquaporins affect the movement of water across cell membranes?
Flashcards
Amphipathic lipids
Amphipathic lipids
Molecules with both hydrophilic and hydrophobic parts that form bilayers in water.
Selective permeability
Selective permeability
The property of cell membranes to allow certain molecules to pass while blocking others.
Aquaporins
Aquaporins
Channel proteins that facilitate the transport of water across cell membranes.
Active transport
Active transport
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Fluid mosaic model
Fluid mosaic model
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Study Notes
Cell Membranes & Membrane Transport
- Cell membranes form sheet-like bilayers in water due to amphipathic lipids.
- Lipid bilayers have selective permeability.
- Molecules move across the bilayer through diffusion.
- Integral and peripheral proteins are involved in transport.
- Aquaporins transport water.
- Channel proteins transport substances.
- Pump proteins carry out active transport.
- Facilitated diffusion and active transport affect membrane permeability.
- Glycoproteins and glycolipids affect structure and function.
- Fluid mosaic model describes membrane structure.
Water Potential
- Water dissolves many substances.
- Water moves from less concentrated to more concentrated solutions.
- Predicting water movement depends on the surrounding environment.
- Plant tissues react differently to hypotonic and hypertonic solutions.
- Cells without cell walls react differently to water movement.
- Cells with cell walls react differently to water movement.
- Isotonic solutions have medical applications.
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