Fubctions Of Cell Membranes

Question 0

Properties of head

Answer 0

Attracted to water,
hydrophilic
polar,
phosphate group

Question 1

All 5 functions of cell membranes

Answer 1

Controls entry and exits--> PP membrane 
Isolates organelles- specific MR within 
Internal transport 
Cell signalling 
Allows electrical impulses to pass

Question 2

Properties of tail

Answer 2

Repelled from h2o molecules
Hydrophobic
Non polar
Hydrocarbon

Question 3

Why is it called fluid mosaic

Answer 3

Fluid- molecules in membrane are in constant motion

Mosaic- what the membrane would look like from above- mosaic from the proteins scattered about

Question 4

Function of phospholipids

Answer 4

Forms a bilayer which is the fundamental basis in which all other components are embedded

Forms a barrier to water soluble charged substances- ions

Question 5

Function of cholesterol

Answer 5

REGULATES fluidity in the membrane- prevents stiffening in low temps

Question 6

Function of proteins and glycoproteins

Answer 6

Form channels that water soluble substances can pass
Transporters- move subs across membrane up CG
Cell signalling
Cell recognition- precise structure means their specific to a particular C
Act as enzymes

Question 7

Why is a membrane with cholesterol likely to be from an animal cell

Answer 7

Cholesterol is used for strengthening, animal cells need stronger membranes as they have no walls

Question 8

Function of intrinsic protein

Answer 8

Form channels or carriers for water soluble molecules

Question 9

Function of extrinsic proteins

Answer 9

Act as enzymes

Question 10

Function of glycolipids

Answer 10

Make membrane stable

Help cells attach onto each other