Transport Across The Cell Membrane

Question 1

What is the cell membrane made of?

Answer 1

proteins and phospholipids

Question 2

What does selectively permeable mean?

Answer 2

Passive(Diffusion and Osmosis) and Active Transport

Question 3

What does selectively permeable mean?

Answer 3

it only lets certain substances through the membrane

Question 4

What is passive transport?

Answer 4

It occurs down a concentration gradient and does not require energy.

Question 5

What is diffusion?

Answer 5

The movement of molecules from an area of high concentration to an area of low concentration.

Question 6

What is osmosis?

Answer 6

Movement of water molecules from a higher water concentration to a lower water concentration through a selectively permeable membrane

Question 7

What happens to animal cell is pure water solution?

Answer 7

Animal cell take in water by osmosis and swell and eventually burst

Question 8

What happens to animal cell is strong salt solution?

Answer 8

Animal cell lose water by osmosis and shrink

Question 9

What happens to plant cell in strong salt solution solution?

Answer 9

Plant cells lose water by osmosis and become plasmolysed

Question 10

What happens to plant cell in pure water solution?

Answer 10

Cell gain water by osmosis and become turgid

Question 11

What is active transport?

Answer 11

the movement of ions or molecules across a cell membrane from a region of lower concentration to a region of higher concentration, assisted by enzymes and requiring energy.

Question 12

Describe differences between passive and active transport?

Answer 12

Passive transport is down concentration gradient while other is against

Question 13

Which type of transport involves membrane proteins?

Answer 13

Active Transport

Question 14

What denatures at high temperature and by acid?

Answer 14

Proteins

Question 15

What dissolves in ethanol?

Answer 15

Phospholipids

Question 16

What Substances can diffuse in out out of animal cell?

Answer 16

Oxygen CO2 Glucose

Question 17

What do you use to test for Starch and what colours does it start and ends as?

Answer 17

Iodine solution it starts at brown and ends at blue/blacl

Question 18

What do you use to test for Glucose and what colours does it start and ends as?

Answer 18

Benedict solution is starts as blue and ends as brick red.

Question 19

What molecule can pass trough the cell membrane and why(starch or glucose)?

Answer 19

Glucose because it’s small enough to diffuse while starch cells are too big

Question 20

Why do plant cell not burst when placed in water solution?

Answer 20

Because of the cell wall protecting it?

Question 21

What advantage is to a plant if it’s turgid?

Answer 21

They can store water and they can help keep the cell upright

Question 22

What factors affect active transport?

Answer 22

Glucose concentration

Oxygen concentration

Temperature

Anything that limits respiration as it provides energy for the process