MCB 244 Lecture Notes - Lecture 4: Scanning Electron Microscope, Centrosome, Nuclear Membrane

• School: University of Illinois
• Department: Molecular and Cell Biology
• Course: MCB 244
• Professor: C Brown

Document Summary

Chapter 4 slides: list the lipid components of the plasma membrane, and explain the actions of each component. Portra(cid:455)ed i(cid:374) the (cid:373)e(cid:373)(cid:271)ra(cid:374)e as a (cid:862)(cid:271)alloo(cid:374) (cid:449)ith t(cid:449)o tails(cid:863) The balloon (cid:862)head(cid:863) is polar a(cid:374)d h(cid:455)drophili(cid:272) (cid:894)filli(cid:374)g (cid:449)ith (cid:449)ater(cid:895) The tails are nonpolar and hydrophobic (scared of water. Form two parallel sheets of molecules lying tail to tail: hydrophobic tails for internal environment of membrane, hydrophilic polar heads directed outward. Phospholipid bilayer is the basic structure of the framework: ensures cytosol remains inside the cell, ensures interstitial fluid remains outside. Helps form glycocalyx (cid:862)(cid:272)oati(cid:374)g of sugar(cid:863) o(cid:374) (cid:272)ell"s surfa(cid:272)e: differentiate between the two types of plasma membrane proteins based on their relative position in the plasma membrane. Half of plasma membrane by weight; float and move in fluid bilayer. Embedded within, and extend across, phospholipid bilayer. Hydrophilic regions are exposed to aqueous environments on either side of membrane.