PSL201Y1 Study Guide - Comprehensive Final Exam Guide - Robert E. Lee, Ion, Gastrointestinal Tract
Document Summary
Hydrophilic head face the cytosol and the extracellular fluid. Cholesterol molecules interfere with hydrophobic interactions between phospholipid tails. Causes crystallization of the bilayer thereby decreasing its fluidity. Membrane proteins are dispersed throughout the bilayer. Integral membrane proteins maintain contact with both the lipid bilayer and the aqueous environment. Transmembrane proteins span the lipid bilayer (e. g. ion channels) Others are located only on one side (e. g. g proteins) Peripheral membrane proteins are located on the cytosolic surface. Can be dissociated from membrane and leave it intact. Membrane carbohydrates covalently bond to membrane lipids or proteins. Function as a protective layer (glycocalyx) that holds cells together and aids in cell recognition and cell labelling. Nuclei contain genetic material of the cell, dna. Dna exists as thin threads called chromatin. Consists of two membranes that fuse intermittently. Leaves nucleus pores that allow selective movement of molecules. Nucleolus is within the nucleus and serves as the site of synthesis of rrna.
