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Questions and Answers
What is the fluid-mosaic model?
What are the 6 main functions of proteins in cell membranes?
What does it mean when some cell membranes are selectively permeable?
What is diffusion and how does it differ from active transport?
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What is facilitated diffusion? Does it require energy?
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Study Notes
Cell Membranes
- The fluid-mosaic model describes the structure of cell membranes, which consist of a phospholipid bilayer with embedded proteins, allowing for selective permeability.
Protein Functions in Cell Membranes
- Proteins in cell membranes perform six main functions:
- Receptors for signal transduction
- Enzymes for catalyzing chemical reactions
- Transporters for moving molecules across the membrane
- Cell-cell recognition and adhesion
- Anchoring the cytoskeleton
- Cell signaling and communication
Selective Permeability
- Selectively permeable cell membranes allow certain molecules to pass through while restricting others, maintaining internal cellular conditions.
Diffusion and Active Transport
- Diffusion is the passive movement of molecules from an area of high concentration to an area of low concentration, resulting in uniform distribution.
- Active transport, in contrast, is the energy-dependent movement of molecules against their concentration gradient, often requiring ATP.
Facilitated Diffusion
- Facilitated diffusion is a type of passive transport in which molecules move down their concentration gradient with the assistance of transport proteins, but does not require energy input.
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Description
Test your knowledge of the fluid-mosaic model and the main functions of proteins in cell membranes with this Biology Chapter 5 Exam Review Quiz. Brush up on your understanding of membrane structure and protein functions in cell biology.