Flashcards in Lecture 4 Deck (16):
main components of Biological membranes
important component in the biological membranes of animal cells
Components of biological membranes
1. Phospholipid bilayer
2.Interior protein network
3. Cell-surface markers
4. Transmembrane proteins
Provides selectively permeable barrier and a matrix for proteins
proteins located on the inside of the cell that are associated with the membrane, also called peripheral membrane proteins. Generally used to reinforce the membrane’s shape.
Interior protein network
proteins that are either embedded in or span the lipid bilayer. They are able to move around just as the lipids do. These can be responsible for many functions
such as transport of nutrients or cell to cell signaling.
proteins that will only let a specific molecule into or out of the cell.Can be channels or carriers
these proteins bind to molecules on the outside of the cell (such as hormones), and transmit the signal to the inside of the cell.
Cell surface receptors
Proteins and glycoproteins help identify the cell within the body.
Cell‐surface identity marker
Cell to cell adhesion molecules
Proteins can be used by cells to attach to one another. These linkages can be short lived or quite strong
Attachment to cytoskeleton
Cell to cell adhesion proteins are often also linked to the cytoskeleton of the cell as well.
The interactions of the phospholipids and proteins within the membrane are quite weak, allowing them to move freely if unanchored to the cytoskeleton
fluid mosaic model
more ________, the more rigid the membrane, but a more rigid membrane is less delicate than a ____ one
Typically, cholesterol makes up about ___ of the molecules found in every cell membrane, because it is small, it only accounts for ___ of the weight