lecture_6 - Lecture 6 Membranes Presumably arose from...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Lecture 6 Membranes Presumably arose from primitive vescicles Define cellularity as boundary between living things and the environment Functions: Protection Selective permeability Concentrate cell components Structure Lipid bilayer Proteins Integral Peripheral Role of amino acid side chains Polysaccharides can be attached to proteins and lipid heads protrude into aqueous environment Fluidity Question: are membrane proteins free to move about in the lipid bilayer? Hypothesis: proteins are free to diffuse Experimental set up: label proteins of cell A with a fluorescent dye, fuse cell A with non- labeled B cell. Observe fused cell AB Test: Hypothesis is supported if fused cell AB displays movement of fluorescent proteins away from original half of A. Hypothesis is rejected if labeled proteins stay bunched to one side Observation: Proteins move to other half Membrane functions Recognition: sponge cells Adhesion: desmosomes
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 06/07/2009 for the course BIS BIS2A taught by Professor Lucacomai during the Spring '09 term at UC Davis.

Page1 / 2

lecture_6 - Lecture 6 Membranes Presumably arose from...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online