Temperature affection Membranes

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  • Created by: Jasmin
  • Created on: 20-10-14 20:07
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  • Cell Membranes
    • Membranes are affected by temperature
      • 1) Temperatures below 0C -The phospholipids dont have much energy so they cant move much They are packed closely together and the membrane is rigid.
        • But channel proteins and carrier proteins in the membrane denature increasing the permeability of the membrane. Ice crystals may form nd pierce the membrane , making it highly permeable
      • Temperatures between 0 and 45
        • The phospholipids can move around and are not packed as tightly together
        • The membrane is partially permable
        • As the temperature increases the phospholipids move more because they have more energy -this increases the permeability of the membrane
      • Temperatures above 45
        • The phospholipid bilayer starts to melt (break down) and the membrane becomes more permable
        • Water inside the cell expands -putting pressure on the membrane
        • Channel proteins and carrier proteins in the membrane denature so they cant control what enters and leaves the cell -this increases the permeability of the membrane

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