BIo chap 5

Question 1

structure of cell membranes

Answer 1

lipids are the main component of cell membrane…

*proteins are often associated with the membrane

Question 2

amphipathic

Answer 2

molecules with both hydrophilic and hydrophobic regions

Question 3

Cholesterol

Answer 3

-major component of animal cell membranes, 30% by mass

amphipathic

Question 4

low temp cholesterol

Answer 4

prevents phospholipids from packing tightly with other phospholipids and therefore increases membrane fluidity

Question 5

transporters

Answer 5

moving ions or other molecules across the membrane

Question 6

channels

Answer 6

allow movement of molecules through them

Question 7

receptors

Answer 7

allow the cell to receive signals from the environement

Question 8

anchors

Answer 8

attach to other proteins that help to maintain cell structure and shape

Question 9

integral membrane proteins

Answer 9

permanently associated with cell membranes and cannot be separated from the membrane experimentally without destroying the membrane

Question 10

Peripheral membrane proteins

Answer 10

temporarily associated with the lipid bilayer or with integral membrane proteins through weak noncovalent interactions
***easily separated