Biological Membranes

Question 1

Selectively permeable membrane

Answer 1

Able to select what is allowed to cross other the membrane

Question 2

Diffusion

Answer 2

Particles moving from area of high conc to low conc until equilibrium reached

Question 3

Osmosis

Answer 3

Net movement of water from area of high conc to low conc across selectively permeable membrane until equilibrium

Question 4

Active transport

Answer 4

Molecules going against conc gradient area of low conc to area of high conc requires atp

Question 5

Fluid mosaic model

Answer 5

Plasma membrane is a mosaic of components containing organelles moving freely and fluidity in membrane

Question 6

Phospholipid

Answer 6

Phosphate
Glycerol
Fatty acid tails

Question 7

Hydrophilic head

Answer 7

Water loving

Question 8

Hydrophobic tail

Answer 8

Water fearing

Question 9

Polar head

Answer 9

Slight charge

Question 10

Non polar tail

Answer 10

No charge

Question 11

Amphiphillic molecule

Answer 11

Hydrophobic and hydrophilic regions present

Question 12

What can pass through

Answer 12

Non polar small molecules can pass through simple diffusion passive process

Question 13

What can’t pass through

Answer 13

Ions and large polar molecules

They have to go through protein channels by active transport or facialated diffusion

Question 14

Extrinsic protein

Answer 14

Produces enzymes

Question 15

Glycolipid

Answer 15

Lipid with carbohydrate chain

Question 16

Glycoproteins

Answer 16

Carbohydrate chain attached signal

Question 17

Intrinsic protein

Answer 17

Passage for ions contains specific channels for specific molecules

Question 18

Cholesterol

Answer 18

Regulate fluidity

Question 19

Why a bilayer

Answer 19

Stabilise structure of membrane and keep it fluid

Question 20

Factors affecting RoD

Answer 20

Conc gradient 
SA
Diffusion distance 
Temp
Molecules

Question 21

Temp

Answer 21

Increase temp increase KE of particles increasing RoD as molecules move faster pas over membrane faster phospholipids become more permeable increase permeability

Question 22

Diff distance

Answer 22

Thinner membrane shorter distance faster rate of diff

Question 23

SA

Answer 23

More diffusion take place across large area

Question 24

Size of molecules

Answer 24

Smaller molecules simple diffusion faster rate
Larger molecule faciallated diffusion
Slower

Question 25

Conc gradient

Answer 25

High conc faster rate

Question 26

Leaky membrane as

Answer 26

Phospholipid bilayer becoming too permeable meaning unwanted substances enter or valuable substances leave