Lecture 3- cell membranes

Extensionofcytoplasmcomeoutaroundotherprotist

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: tbook !Figure*5.19*page*107*for*diagram Transport Proteins Gardiner 2013 !*uniport:*primary*transport*pumps !symport*and*antiport!*secondary*transport*pumps 1202B 10:25 BIOLOGY 1. Uniport – single solute carried across membrane by transport protein 2. Symport – two different solutes carried across membrane at same time in same direction by transport protein 3. Antiport – two different solutes carried across membrane in opposite direction by transport protein 35 !&One&red&molecule&from&the&inside&is&transferred&across& BIOLOGY 1202B Uniport – single solute carried across membrane by transport protein 10:25 Gardiner 2013 the&pink&membrane&into&the&other&space 36 12 BIOLOGY 1202B Symport – two different solutes carried across membrane in same direction by p rotein. 10:25 Gardiner 2013 37 !*Two*solutes*carried*across*but*in*opposide*directions BIOLOGY !NA*travels*from*the*cell*out !K*travels*into*the*cell 1202B Antiport – two different solutes carried across membrane in opposite directions by protein. 10:25 Gardiner 2013 38 Exocytosis and endocytosis transport large molecules • Large molecules, such as polysaccharides and proteins, cross the membrane via vesicles. !Endo&and&exco&cytosis&allow&the&import&and&export&of& larger&molecules& !Both&endo&and&exco&cytosis&require&energy !Allow&molecules&to&leave/enter&cells&without&directly& passing&through&the&plasma&membrane • During exocytosis, a transport vesicle budded from the Golgi apparatus is moved by the cytoskeleton to the plasma membrane. • When the two membranes come in contact, the bilayers fuse and spill the contents to the outside. 10:25 Gardiner 2013 39 !Exocytosis&e...
View Full Document

This note was uploaded on 02/11/2014 for the course BIO 1202B taught by Professor Almanke during the Winter '12 term at UWO.

Ask a homework question - tutors are online