Transport Across Membrsne Mauuran Master

Question 1

Membrane

Answer 1

Phospholipid bilaYer
Hydrophobic tail points inwards and hydrophilic heads on the surface
FlUid mosaic structure en
Flexible
Proteins glycoprotein glycolipids cholesterol

Question 2

WhY phospholipid is hydrophobic

Answer 2

Carbons and hydrogen
Non poor
Hydrophobic

Question 3

Bilayer

Answer 3

Phospholipid lieorientsted towards hydrophilic
F.A oreitnated away from water -hydrophobic
-stabilising of structure
-can from food mosaic
And other compounds

Question 4

Polar

Answer 4

Y ever distribution of charge

Question 5

Extrinsicboroteins

Answer 5

-peripheral proteins
-transports -faculkitate diffusion
-enzymes cascade of reactions

Respiration +phyosynthesise

Question 6

Cholesterol

Answer 6

Increase h bonds between neighbouring phospholipids
So increase stability of membrane

Question 7

What membrane proteins act as

Answer 7

Enzymes
Hormone receptors
Molecule for cell recognition
Antigen

Question 8

Centre of phospholipid have what properties

Answer 8

Hydrophobic
Does not allow water soluble molecules through
Small non polar substances move

Question 9

Simple diffusion

Answer 9

Pass directl through phospholipid bilaYer
Small non polar
Oxygen or carbon dioxide
High to low conc

Question 10

Facilitated diffusion

Answer 10

Large water soluble
Carrier or channel proteins
Carrier proteins have binding sites for molecules like glucose
Only allow glusocse to pass
Channel proteins help diffusion of ions in or out of the cells