Cell Membranes

Description

A-Level Biology (Cells) Mind Map on Cell Membranes, created by Alex Lyes on 25/05/2016.
Alex Lyes
Mind Map by Alex Lyes, updated more than 1 year ago
Alex Lyes
Created by Alex Lyes about 8 years ago
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Resource summary

Cell Membranes
  1. Structure
    1. Role
      1. Barrier between the cell & the environment
        1. Controls what enters & leaves
        2. Partially permeable
          1. Fluid mosaic
            1. Phospholipids are constantly moving
              1. Proteins are scattered throughout the bilayer
              2. Bilayer
                1. Phospholipids
                  1. Head
                    1. Hydrophilic
                      1. Attracts water
                      2. Tail
                        1. Hydrophobic
                          1. Repel water
                          2. Doesn't allow water-soluble substances through
                          3. Cholersterol
                            1. Helps maintain shape
                            2. Increasing temp increases permiability
                            3. Diffusion
                              1. Passive
                                1. Simple
                                  1. Diffuse simply across the membrane
                                    1. Depends on concentration gradient
                                      1. Depends on thickness
                                        1. Depends on surface area
                                        2. Facilitated
                                          1. Carrier proteins & channels
                                            1. Larger molecules
                                              1. Charged molecules
                                                1. Depends on concentration gradient
                                                  1. Depends on the number of channels / carrier proteins
                                                  2. Down concentration gradient
                                                  3. Osmosis
                                                    1. Diffusion of water molecules
                                                      1. Partially permeable membrane
                                                        1. High to low water potential
                                                          1. Water has 0
                                                            1. The more solute then the lower the water potential
                                                            2. Conditions same as diffusion
                                                            3. Active Transport
                                                              1. Active process
                                                                1. Against concentration gradient
                                                                  1. Carrier proteins
                                                                    1. ATP
                                                                      1. Source of energy
                                                                        1. Hydrolysed to ADP & P
                                                                          1. Releases energy
                                                                        2. Conditions
                                                                          1. Speed of proteins
                                                                            1. Number of proteins
                                                                              1. Rate of respiration
                                                                              2. Co-transport
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