Lecture 2

Question 1

functions of cell membranes

Answer 1

• physical isolation
• regulation of exchange with environment (semi-perm)
• communication between cell and environ.
• structural support

Question 2

Cell membrane composed of…

Answer 2

lipid, protein, and small amount of carbs

Question 3

T/F, Cell membranes are all created equally

Answer 3

F

Question 4

The more metabolically active the membrane is the more….. it contains

Answer 4

protein

Question 5

What 3 types of amphipathic lipids are found in cell membranes?

Answer 5

• phospholipids
• sphingolipids
• cholesterol

Question 6

phospholipids

Answer 6

major lipid

Question 7

sphingolipids

Answer 7

lipid rafts

Question 8

cholesterol

Answer 8

increase viscosity and decreases permeability

Question 9

extracellular surface of cell membrane contains…

Answer 9

glycoproteins and glycolipids

Question 10

intergral proteins roles

Answer 10

• membrane receptors
• cell adhesion molecules
• transmember movement
• enzymes
• mediators of intracellular signalling

Question 11

peripheral proteins role

Answer 11

• participate in intracellular signalling

- form submembraneous cytoskeleton

Question 12

peripheral proteins attache to…

Answer 12

loosely to phospholipid head of intergral proteins

Question 13

transmembrane proteins

Answer 13

integral proteins

Question 14

lipid anchored proteins

Answer 14

associated with sphingolipids and anchor with sugar-phosphate chain

Question 15

lipid anchored proteins and lipid rafts have…

Answer 15

high cholesterol content - therefore, more viscous regions

Question 16

lipid rafts

Answer 16

contain an abundance of proteins important in cell signal transduction

Question 17

two different lipid rafts

Answer 17

planar lipid rafts and caveolae

Question 18

carbs in cell membrane include…

Answer 18

glycoproteins and glycolipid