SLE206 Lecture Notes - Lecture 4: Electrochemical Gradient, Endoplasmic Reticulum, Lipid Bilayer

• School: Deakin University
• Department: Science, Engineering and Built Environment
• Course: SLE206
• Professor: Jessica Gibbons

Document Summary

Transport across cell membranes- class 3b + 4 learning objectives. Phospholipids on their own form liposomes which are protein-free lipid bilayers. To recognise the difference between transporter and channel. Transporter: carriers which bind the specific solute to be transported and undergo a series of conformational changes in order to transfer the bound solute across the membrane. Channel: hydrophilic pores that extend across the lipid bilayer that permit diffusion. The electrochemical gradient has 2 components: concentration gradient and membrane potential influence. Osmosis: water moves passively across the cell membrane down a concentration gradient. Water molecules diffuse rapidly through aquaporins channels which selectively conduct h2o molecules. H2o is only semi- permeable to the membrane therefore aquaporins are used to transport more. To be familiar with transporters and their different methods of functioning. Passive transporters: move solute across its electrochemical gradient: glucose carrier: dependent only on concentration gradient. Light driven pumps: use energy from sunlight (bacteria)