Transport Across Membranes

Question 1

What is the cell membrane made out of?

Answer 1

Phospholids

Protiens

Question 2

Some molecules can form__________________

Answer 2

Channels or “pores”. Some describe the membrane to be porous

Question 3

The cell membrane is selectively permiable. What does this mean?

Answer 3

it controls what substances enter and leaves the cell

Question 4

What is Passive Transport?

Answer 4

When a substance moves down a concentration gradient. (from high to low concentration)

Question 5

How much energy is required for passive transport

Answer 5

0

Question 6

What are (2) examples of passive transport?

Answer 6

Diffusion and osmosis

Question 7

What is Diffusion

Answer 7

The movement of molecules from an area of high concentration to an area of low concentration down a concentration gradient

Question 8

What is Osmosis

Answer 8

The movement of water from an area of high water concentration to an area of low water concentration across a selectively permiable membrane

Question 9

What will happen in an animal cell if it is placed in distilled water

Answer 9

It will gain water and swell. It may even burst

Question 10

What will happen in an animal cell if it is placed in a strong salt solution

Answer 10

The cell will lose water and shrink

Question 11

What does Turgid Mean

Answer 11

The term used to describe a plant cell which has swollen due to the entry of water by osmosis

Question 12

What does plasmolysed mean

Answer 12

The term used to describe a plant cell whose contents have shrunk due to loss of water by osmosis

Question 13

What will happen to a plant cell in distilled water

Answer 13

Will gain water and swell < turgid

Question 14

What will happen to a plant cell in a strong salt solution

Answer 14

will lose water and shrink (plasmolysed)

Question 15

Examples of Substances that move INTO a cell by diffusion

Answer 15

Glucose
Oxygen
Carbon Dioxide

Question 16

Exampled of Substances that move OUT OF a cell by diffusion

Answer 16

Carbon dioxide

Oxygen

Question 17

What prevents a plant cell from exploding

Answer 17

Cell wall

Question 18

Does active transport require energy

Answer 18

Y

Question 19

Describe (using water concentrations) why a plant cell loses weight in a strong solution

Answer 19

Water moves from a high concentration (inside the cell) to a low concentration area (outside the cell)

Question 20

Active transport is the movement of…

Answer 20

molecules from a low concentration to a high concentration AGAINST a concentration gradient through a selectively permiable membrane

Question 21

What sugar moves into a cell by diffuion

Answer 21

glucose

Question 22

What part of the cell membrane allows it to be fluid?

Answer 22

phospholipid

Question 23

What substance has molecules too large to pass through a cell membrane

Answer 23

Starch

Question 24

What allows molecules to cross the cell membrane

Answer 24

the pores in protiens

Question 25

What gas moves out of an animal cell by diffusion

Answer 25

carbon dioxide

Question 26

What gas moves into an animal cell by diffusion

Answer 26

oxygen (also absorbs glucose)

Question 27

In what states of matter does diffusion take place in

Answer 27

liqids and gasses

Question 28

What does Flaccid mean?

Answer 28

plasmolysed

Question 29

What controls active transport

Answer 29

protiens