Class Notes (836,321)
Canada (509,732)
Biochemistry (847)
Prof (22)

Biochemistry Lecture No. 11.docx

1 Page
Unlock Document

Biochemistry 3380G

Biochemistry Lecture No.11: Biological Membranes th Friday September 28 , 2012 Amphipathic Lipids: -Amphipathic lipids have polar groups on one part of the molecule and non-polar ones on the other part and have opposite natures. This results in hydrophilic heads and hydrophobic tails. It is not favourable for the hydrophobic tails to be exposed to water, so they will cluster together to avoid contact The Lipid Bi-Layer: -The lipid bi-layer consists of two sheaths or rows of phospholipids with their hydrophobic tails facing each other. The hydrophobic groups are completely shielded by the hydrophilic phosphates. This structural design forms the physical basis of the cell membrane. Diffusion Of Lipids Within The Bi-Layer: -Lipids move about plane of the lipid bi-layer. Rate that lipids diffuse is a result of the fluidity of the membrane, which is determined by four key factors: temperature (warmer = faster diffusion; colder = gel-like lipid bi-layer), length of chains (longer chains = more Van der Waal’s force and less diffusion; shorter chains more fluid), degree of unsaturation (more double bonds = more fluid due to kinks; less double bonds = less diffusion), and the cholesterol concentration. Cholesterol & Membrane Fluidity:
More Less

Related notes for Biochemistry 3380G

Log In


Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.