Cell Surface/Plasma Membrane
Roles of membrane and components in fluid mosaic model
- Created by: Harriet Goodship
- Created on: 07-01-13 17:52
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- Cell Surface Membrane
- Also known as plasma membrane, and is partially permeable
- Roles of membrane
- Separate cell contents from outside environment
- Separate cell components from cytoplasm
- Cell recognition and signalling
- Holding components of some metabolic pathways in place
- Regulating the transport of minerals into or out of cells
- Membrane components and functions
- Cholesterol
- Stabilise membrane - Maintain fluidity - reduce permeability
- Glycoprotein
- Allow communication across membrane - allow charged particles to pass through membrane
- Channel Protein
- Allow movement of substance across membrane - Allow larger molecules to pass through
- Phospholipid Bilayer
- Act as barrier to charged particles - Select what enters or leaves cell
- Glycolipid
- Involved in cell signalling (along with glycoprotein) and help with immune system
- Cholesterol
- Performing different role
- In cells of growing shoots - membrane contains receptors to detect molecules that regulate growth
- Muscle cell membranes have lots of channels to uptake lots of glucose for muscle contraction
- Chloroplast membrane contains chlorophyll for photosynthesis
- White blood cell membrane contain proteins that recognise foreign cells
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