Biology Notes - The Structure of Membranes Key Idea Plasma membranes are composed of a lipid bilayer in which proteins move freely Made up of

Biology Notes - The Structure of Membranes Key Idea...

This preview shows page 1 - 2 out of 2 pages.

The Structure of Membranes: Key Idea: Plasma membranes are composed of a lipid bilayer in which proteins move freely - Made up of: - Channel protein - Water molecule spass between this by osmosis - Glycoprotein - Carrier Protein - Lipid bilayer - Glycolipid - Phosphate Head - Loves Water - Fatty Acid Tail - hates water Extra Stuff: - Water molecules are able to move around the phospholipid molecules through the process of osmosis - Lipid soluble molecules are able to perform the function of moving through the membrane by diffusion - Phopholipids are able to naturally form a bilayer by joining the hydrophobic parts, pointing away from the water Diffusion in Cells: Key Idea: Diffusion is the movement of molecules from places of higher concentration to places of lower concentration. - How a cell moves through a cell membrane - Simple - Has helper proteins - Facilitated - Occurs in the membrane - `Both - Don’t need extra energy - Rate of Diffusion - Concentration gradient - The distance moved - The surface area -

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture