Active transport Flashcards
(12 cards)
What is active transport?
The movement of particles from a low to an area of high concentration, using energy from respiration and a carrier protein
Why do cells use active transport?
To take in substances that are in lower concentration outside than inside the cell
Where does the energy from active transport come from?
Aerobic respiration from the mitochondria
What are carrier proteins?
Proteins in the cell membrane that use energy to move molecules into and out of a cell
How do root hair cells take in nitrate ions?
Using active transport through carrier proteins that change shape and push ions into the cell using energy
What would normally happen if a substance is more concentrated inside than outside the cell?
It would diffuse out of the cell.
Why doesn’t diffusion work for nitrate uptake in plants?
Because nitrate concentration is higher inside the root hair cell, so diffusion would move them out instead of in.
What changes in the carrier protein to move ions?
Its shape, using energy from respiration.
What happens to potato strips in distilled water?
They get longer
Why do potato strips in distilled water get longer?
Water enters the cells by osmosis since the water concentration is higher outside.
What happens to potato strips in a concentrated solution?
They get shorter
Why do potato strips in a concentrated solution get shorter?
Water leaves the cells by osmosis since the water concentration is lower outside.
