Cell processes 1

Question 1

Membrane structure

Answer 1

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Question 2

Fluid mosaic model

Answer 2

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Question 3

Lipid bilayer structure

Answer 3

Lipid tail embedds into membrane

sugar/protein coating that can be exposed to the outside or inside

Question 4

How much of lipids are phospholipids?

Answer 4

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Question 5

Phospholipid properties

Answer 5

Orientates spontaneously to create a low thermodynamic situation

Question 6

Hydrophobic core

Answer 6

2 molecules wide that is a barrier. only lets lipid soluble substances through

Question 7

Membrane fluidity

Answer 7

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Question 8

Determinants of membrane fluidity?

Answer 8

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Question 9

How does fluidity affect permeability

Answer 9

more chance for molecules to sneak through

Question 10

Membrane proteins

Answer 10

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Question 11

How are cytoskeleton proteins anchored

Answer 11

Peripheral proteins connect cystoskeleton protein to intergral proteins

Question 12

Intergral membrane proteins

Answer 12

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Question 13

functions of membrane proteins

Answer 13

Use membrane to create a localised 3D space for reactions

Question 14

Selective permeability of membrane

Answer 14

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Question 15

Molecules which require no proteins

Answer 15

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Question 16

Molecules which require proteins

Answer 16

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Question 17

What provides the selective permeability

Answer 17

The hydrophobic core

Question 18

Overall function of membrane transport proteins

Answer 18

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Question 19

Are molecules moving once equilibrium has been reached

Answer 19

Yes but there is no net movement

Question 20

Principles of diffusion

Answer 20

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Question 21

Factors affecting rate of diffusion 4

Answer 21

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Question 22

The physical consequences of Diffusion

Answer 22

can increase area by invagination, villi

Question 23

Electrical gradient

Answer 23

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Question 24

why is a there a concentration and electrical gradient?

Answer 24

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Question 25

Cell membrane physics

Answer 25

Insulating ting between two conducting plates like a capacitor store energy/electrical charge

Question 26

Extracellular ion concentrations

Answer 26

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Question 27

30% of energy

Answer 27

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Question 28

Osmosis

Answer 28

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Question 29

Osmotic pressure

Answer 29

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Question 30

Membrane permeability to water

Answer 30

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Question 31

factors affecting rate of osmosis through layer

Answer 31

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Question 32

factors affecting rate of osmosis through aquaporin

Answer 32

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Question 33

differences in Pw

Answer 33

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