National 5 History: Unit 1 Cell Biology- The Plasma Membrane
- Created by: MairiCrosby
- Created on: 04-05-15 11:08
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- Plasma Membrane
- A bi-layer of constantly moving phospholipid molecules and proteins
- Known as fluid mosaic
- FUNCTIONS
- Provide Structural Support
- Contain channels which transport molecules (passively)
- Act as carriers which actively transport molecules
- Contain channels which transport molecules (passively)
- Serves as enzymes catalysing bio-chemical reactions
- Acts as receptors for hormones
- Controls what enters and leaves the cell
- Acts as receptors for hormones
- Provide Structural Support
- STRUCTURE
- Contains hydrophilic heads
- Contains hydrophobic tails
- Has a number of proteins
- Partly embedded
- peripheral membrane protein
- Attached to surface
- Spanning from top to bottom of phospholipid bilayer
- integral membrane protein
- Channel forming proteins
- Where molecules pass through the membrane PASSIVELY to the extra-cellular fluid or the cytoplasm
- Partly embedded
- Has a number of proteins
- Contains hydrophobic tails
- Contains hydrophilic heads
- A bi-layer of constantly moving phospholipid molecules and proteins
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