4661691
Description
Flashcards by Fauzia Ali, updated more than 1 year ago
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Created by Fauzia Ali
over 8 years ago
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| Question | Answer |
| Fluid Mosaic Model | This theory was put forward in 1972 by Singer and Nicholsen. It is like a fluid as the components can move and it is like a mosaic due to the random arrangement of proteins |
| Phospholipid Component | There is the polar hydrophilic phosphate head, and the hydrophobic fatty acid tails. Cells are surrounded by a watery liquid and the inside of a cell is filled with cytoplasm so they arrange themselves as a: |
| Phospholipid Bilayer! This is because the polar heads are attracted to water and the fatty acid tails in the centre repel water! | |
| Protein Component | These are globular proteins. They can either be: Extrinsic or Intrinsic. |
| Extrinsic | They are only made up of hydrophilic amino acids so it cannot sit in the hydrophobic part of the bilayer |
| Intrinsic Protein | These are made up of hydrophobic and hydrophilic amino acids/R chains so they span the whole bilayer. The coiling of the protein makes a hydrophilic channel so charged molecules can pass through |
| Carbohydrate Component | These are attached to proteins or the membrane as a chain and are either glycoproteins or glycolipids (the term glycocalyx is a group term) |
| Roles of Carbohydrates | They act as: Antigens, receptors for specific hormones (adrenaline), A B O blood grouping, receptors for specific neurotransmitters and cell to cell interactions |
| Cholesterol | Regulates fluidity and stability |
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