1.2 Transport In Cells Bioljgy N5
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What is the responsibility of the cell membrane
The cwll membrane controls what molecules can enter and leave the cell
What is the cell membrane composed of ?
A cell membrane is made up of phospholipid molecules and proteins
What do the proteins in the cell membrane do
The proteins in a cell membrane form channels in the membrane
What kind of molecules can pass through the channels made by the proteins
the only kind of molecules that can pass through the channels are ones that are small enough like glucose, oxygen, carbon dioxide and water.
what molecules are able to pass through the cell membrane
molecules that can pass through the cell membrane are glucose, oxygen, carbon doixide and water
what molecules cannot pass through the cell membrane
Molecules that are unable to pass throught the cell memebrane like starch
where do different concentration gradient exist
different concentration gradient exist between cells and their environment
what is a concentration gradient
a concentration gradient is the difference in concentration of a substance between two areas, such as thye inside and outside of a cell.
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
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
what kind of transport requires no energy
passsive transport e.g. Diffusion and Osmosis
what happens during the process of Diffusion
during diffusioin molecules move down the concentration gradient from higher to lower and requires no energy as it is a passive transport
what state do substances have to be in for Diffusion to occur
Diffusion can only occur in liquids and gases as these are the only states were the molecules are free to move
why is Dfiffusion an important process
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
what process isa the movement of water from a higher water concentration to a lower concentration
osmosis
what kind of transport is osmosis
osmosis is a passive transpot (does noitt require energy)
what happens if a solutio gains water by osmosis
if a solution gains water through osmosis it increases in volume
what happens if a cell loses in water
the cell decreases in water by osmosis it decreases mass
what happens if a cell gains water through osmosis
if a cell increases in water through osmosis it increases mass
what happens if a solution loses water through osmosis
if a solution decreases in water by osmosis it decreases in volume
what happens when a animal cell is placed in a solution with a higher water concentration
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
what happens to a animal cell if it’s placed in a lower concentration of water
the water in the cell will leave the cell through osmosis and shrink and shrivel
what happens to plant cell if it’s placed in a higher water concentration
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
how does a plant cell become p[lasmolysed
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
how may a cell remain unchanged
a cell remains unchanged if it’s put in a solution of equal concentration