membranes

Question 1

What is a partialy permeable membrane

Answer 1

a membrane that can seceltivley choose what it allows through it

Question 2

What are the roles of a membrane on the cell surface

Answer 2

Separates a cells components from its envirnement

Regulates the transport of things in and out of the cell

Have antigensso that the organism can recognise its own cells

Contains receptors and can release hormones for cell signalling

Question 3

What are the roles of a membrane on the cell interior

Answer 3

Increases surface in organelles such as mitochondria and chloroplasts

keeps all organelles sperated

Contains powerful hydrolytic enzymes

Question 4

What is a glycoprotein

Answer 4

a carbohydrate chain attached to a protein molecule

Question 5

What is a glycolipid

Answer 5

A carbohydrate chain attached to a lipid molecule

Question 6

Chaat is a chenille protein

Answer 6

A protein that allows large and polar molecules to pass through the membrane

Question 7

What is a channel protein

Answer 7

a portein that attaches to molecules and uses tap to move them against the conc gradient

Question 8

How many phospholipids in one bilayer

Answer 8

2

Question 9

how thick is the phospholipid bilayer

Answer 9

5-10nm

Question 10

What is simple diffusion

Answer 10

The net movement of molecules down the conc garaging using the ke that particles already have

Question 11

What effects the rate of simple diffusion

Answer 11

Temp

Diffusion distance

Surface area

Conc Gradient

Question 12

What is osmosis

Answer 12

The net movement of water molecules from an area of negative water potential to an area of more negative water potential across a partially permeable membrane

Question 13

What is water potential

Answer 13

A measure of the tendency of water molecules to diffuse from one region to another

Question 14

What is the water potential of water

Answer 14

0

Question 15

What happens to water potential as more things are dissolved

Answer 15

it decreases (more negative)

Question 16

What is cytolysis

Answer 16

When too much water enters an animal cell and out bursts

Question 17

What is it called when water enters a plant cell and makes it rigid

Answer 17

turgid

Question 18

What is creation

Answer 18

What amiinals cells shrivel

Question 19

What his plasmolysis

Answer 19

When plant cells pop

Question 20

What is it called when RBC pop

Answer 20

haemolysis

Question 21

What is active transport

Answer 21

the movement of molecules against the conc gradient using tap and a carrier protein

Question 22

What is endocytosis

Answer 22

When large molecules do not pass through the membrane
This is when the cell surrounds the thingy and encloses it in a vesicle inside the cell

Question 23

What is exocytosis

Answer 23

How large molecules exit the cell. There vesicle fuse with the cell membrane and release it

Question 24

Effect of temperature rise on membrane permeablity

Answer 24

Temporary gaps appear more often, permeability increases, fluidity increases. Cell signalling is easier

Question 25

Effect of temperature fall on membrane permeability

Answer 25

Saturated fatty acids become compressed
fluidity and permebalilty decreases

Question 26

What effects the fluidity of a membrnae

Answer 26

The porportion of unsaturated fatty acids at cholesterol

Question 27

What is the effect of solvents of cell membranes

Answer 27

Thery can dissolve lipids and damage the cell wall