Cell Membranes

Question 1

2 types membrane proteins

Answer 1

Integral and Peripheral

Question 2

Membrane potential is … differences across plasma membrane

Answer 2

is electrical charge differences

Question 3

Outside plasma membrane is … ve

Answer 3

positi-ve

Question 4

Inside plasma membrane is … ve

Answer 4

negati-ve

Question 5

% Lipids in plasma membrane

Answer 5

45-50%

Question 6

% protein in plasma membrane

Answer 6

45-50%

Question 7

% carbohydrate in plasma membrane

Answer 7

4-8%

Question 8

… is collection of glycolipids, glycoproteins, carbs on outer surface of plasma membranes

Answer 8

glycocalyx

Question 9

5 function of plasma membranes

Answer 9

1. encloses
2. support cell contents
3. attaches cels to extracellular environment/other cells
4. recognize/communicate w/ other cells
5. control what goes in or comes out

Question 10

main chemical components of plasma membrane

Answer 10

45% lipids, 45% protein, 10% carbs

Question 11

fluid mosaic model summary:

Answer 11

1. plasma membrane is flexible, can change shape and composition.
2. dense liquid in which proteins are suspended
3. membranes can fuse with another

Question 12

Marker proteins

Answer 12

Glycoproteins and glycolipids

Question 13

Attachment proteins ex:

Answer 13

Cadherins and integrins

Question 14

3 classes transport proteins

Answer 14

channel proteins, carrier proteins, ATP-powered pumps

Question 15

3 types channel proteins

Answer 15

Leak / non-gated ion channels

Gated ion channels: ligand-gated and voltage-gated

Question 16

Cystic fibrosis affects … channels

Answer 16

Chloride ion channels

Question 17

Cystic fibrosis affects what organs mostly

Answer 17

lungs and pancreas