Fluid Mosaic Model & Membrane Structure

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A-Level Biology (Membranes and Membrane Transport) Flashcards on Fluid Mosaic Model & Membrane Structure, created by Fauzia Ali on 26/02/2016.
Fauzia Ali
Flashcards by Fauzia Ali, updated more than 1 year ago
Fauzia Ali
Created by Fauzia Ali over 8 years ago
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Resource summary

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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