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5551563
Cell Membranes
Description
A-Level Biology (Cells) Mind Map on Cell Membranes, created by Alex Lyes on 25/05/2016.
No tags specified
biology
a level
aqa
cell membranes
biology
cells
a-level
Mind Map by
Alex Lyes
, updated more than 1 year ago
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Created by
Alex Lyes
over 8 years ago
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Resource summary
Cell Membranes
Structure
Role
Barrier between the cell & the environment
Controls what enters & leaves
Partially permeable
Fluid mosaic
Phospholipids are constantly moving
Proteins are scattered throughout the bilayer
Bilayer
Phospholipids
Head
Hydrophilic
Attracts water
Tail
Hydrophobic
Repel water
Doesn't allow water-soluble substances through
Cholersterol
Helps maintain shape
Increasing temp increases permiability
Diffusion
Passive
Simple
Diffuse simply across the membrane
Depends on concentration gradient
Depends on thickness
Depends on surface area
Facilitated
Carrier proteins & channels
Larger molecules
Charged molecules
Depends on concentration gradient
Depends on the number of channels / carrier proteins
Down concentration gradient
Osmosis
Diffusion of water molecules
Partially permeable membrane
High to low water potential
Water has 0
The more solute then the lower the water potential
Conditions same as diffusion
Active Transport
Active process
Against concentration gradient
Carrier proteins
ATP
Source of energy
Hydrolysed to ADP & P
Releases energy
Conditions
Speed of proteins
Number of proteins
Rate of respiration
Co-transport
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