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Flashcards in Lecture 4 Deck (16):
1

main components of Biological membranes

phospholipids

2

important component in the biological membranes of animal cells

Sphingolipids

3

p.5

yes

4

Components of biological membranes

1. Phospholipid bilayer
2.Interior protein network
3. Cell-­surface markers
4. Transmembrane proteins

5

Provides selectively permeable barrier and a matrix for proteins

Phospholipid bilayer

6

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

7

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.

Transmembrane proteins

8

Transporters

proteins that will only let a specific molecule into or out of the cell.Can be channels or carriers

9

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

10

Proteins and glycoproteins help identify the cell within the body.

Cell­‐surface identity marker

11

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

12

Attachment to cytoskeleton

Cell to cell adhesion proteins are often also linked to the cytoskeleton of the cell as well.

13

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

14

more ________, the more rigid the membrane, but a more rigid membrane is less delicate than a ____ one

cholesterol, fluid

15

Typically, cholesterol makes up about ___ of the molecules found in every cell membrane, because it is small, it only accounts for ___ of the weight

50%, 20%

16

6 function of the membrane proteins

Transporters
Cell surface receptors
Cell­‐surface identity marker
Cell to cell adhesion molecules
Attachment to cytoskeleton
enzymatic