1.2 Transport In Cells Bioljgy N5

Question 1

What is the responsibility of the cell membrane

Answer 1

The cwll membrane controls what molecules can enter and leave the cell

Question 2

What is the cell membrane composed of ?

Answer 2

A cell membrane is made up of phospholipid molecules and proteins

Question 3

What do the proteins in the cell membrane do

Answer 3

The proteins in a cell membrane form channels in the membrane

Question 4

What kind of molecules can pass through the channels made by the proteins

Answer 4

the only kind of molecules that can pass through the channels are ones that are small enough like glucose, oxygen, carbon dioxide and water.

Question 5

what molecules are able to pass through the cell membrane

Answer 5

molecules that can pass through the cell membrane are glucose, oxygen, carbon doixide and water

Question 6

what molecules cannot pass through the cell membrane

Answer 6

Molecules that are unable to pass throught the cell memebrane like starch

Question 7

where do different concentration gradient exist

Answer 7

different concentration gradient exist between cells and their environment

Question 8

what is a concentration gradient

Answer 8

a concentration gradient is the difference in concentration of a substance between two areas, such as thye inside and outside of a cell.

Question 9

if a cell that has 0.2m concentration put in distilled water state

the lower/higher concentration gradient of water

the higher/lower concentration gradient of salt

Answer 9

the lower concnetration of water is inside the cell and the higher concentration is outside the cell

the higher concentration is inside the cell and the lower concnetration is outside the cell

Question 10

what kind of transport requires no energy

Answer 10

passsive transport e.g. Diffusion and Osmosis

Question 11

what happens during the process of Diffusion

Answer 11

during diffusioin molecules move down the concentration gradient from higher to lower and requires no energy as it is a passive transport

Question 12

what state do substances have to be in for Diffusion to occur

Answer 12

Diffusion can only occur in liquids and gases as these are the only states were the molecules are free to move

Question 13

why is Dfiffusion an important process

Answer 13

diffusion is an important process because it is how things enter and leave the cell for example diffusion is a key part in the process of respiration whereglucose reacts with oxygen and waste water and carbon dioxide are produced that are diffused out the cell

Question 14

what process isa the movement of water from a higher water concentration to a lower concentration

Answer 14

osmosis

Question 15

what kind of transport is osmosis

Answer 15

osmosis is a passive transpot (does noitt require energy)

Question 16

what happens if a solutio gains water by osmosis

Answer 16

if a solution gains water through osmosis it increases in volume

Question 17

what happens if a cell loses in water

Answer 17

the cell decreases in water by osmosis it decreases mass

Question 18

what happens if a cell gains water through osmosis

Answer 18

if a cell increases in water through osmosis it increases mass

Question 19

what happens if a solution loses water through osmosis

Answer 19

if a solution decreases in water by osmosis it decreases in volume

Question 20

what happens when a animal cell is placed in a solution with a higher water concentration

Answer 20

if a animal cell is placed in a higher concentration of water the water will enter the cell through osmosis will start to swell and burst

Question 21

what happens to a animal cell if it’s placed in a lower concentration of water

Answer 21

the water in the cell will leave the cell through osmosis and shrink and shrivel

Question 22

what happens to plant cell if it’s placed in a higher water concentration

Answer 22

water enters the cell by osmosis causing the vacoule to swell although the cell will not burst due to the cell wall which is called being turgid

Question 23

how does a plant cell become p[lasmolysed

Answer 23

a plant cell becomes plasmolysed when the cell is placed in a solution with a low water concentration and the water leaves the cell through osmis

Question 24

how may a cell remain unchanged

Answer 24

a cell remains unchanged if it’s put in a solution of equal concentration