BI110 Lecture Notes - Lecture 14: Electrochemical Gradient, Passive Transport, Antiporter

• School: WLU
• Department: Biology
• Course: BI110
• Professor: Matthew Smith

Document Summary

Travelling from areas of high concentration to low concentration. Simple diffusion allows molec to freely cross the plasma mem, along their conc gradient. Moving directly through the lipid bilayer without any help. Facilitated diffusion (channels, carriers) allows molec to move through a membrane protein along their conc gradient. Channel allows molec to pass through only if it is moving from high to low. Passive if moving from high to low (but still not necessarily) Both of these only work along their conc gradient. Active transport = the uphill movement of molec against a conc gradient, requires energy. Primary active transport = uses energy (atp) directly to move molec against their conc gradient is not coupled to atp directly. Secondary active transport = movement of molec against conc gradient, but is not coupled to atp directly gradient, but is not coupled to atp directly. Antiporters = move 2 molec in opposite directions. Symporters/uniporters = move molec in the same direction.