Textbook Notes (362,882)
Canada (158,081)
Biology (653)
BIO310H5 (13)
Chapter 3

Ch. 3 Book Notes: Cell Structures and Protein function

3 Pages
Unlock Document

University of Toronto Mississauga
Angela B Lange

Ch 3 Cell structures and Protein Function Membranesmembranes form a major structural element in cells most universal role of membranes is to act as a selective barrier to the passage of molecules allowing some molecules to cross while excluding others the plasma membrane regulates the passage of substances into and out of the cell whereas the membranes surrounding cell organelles allow the selective movement of substances between the organelles and the cytosol one of the advantages of molecules across membranes is confining the products of chemical reactions to specific organellesFunctions of cell membranes1 Regulate the passage of substances into and out of cells and between cell organelles and cytosol 2 Detect chemical messengers arriving at the cell surface 3 Link adjacent cells together by membrane junctions 4 Anchor cells to the extracellular matrix Membrane structure all membranes consist of a double layer of lipid molecules containing embedded proteins the major membrane lipids are phospholipidsthese are amphipathic molecules one end has a charged or polar region and the remainder of the molecule which consists of two long fatty acid chains is nonpolar the phospholipids in cell membranes are organized into a bimolecular layer with the nonpolar fatty acid chains in the middle the polar regions of the phospholipids are oriented toward the surface of the membrane as a result of their attraction to the polar water molecules in the extracellular fl
More Less

Related notes for BIO310H5

Log In


Don't have an account?

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.