active transport - SB1 Flashcards
1
Q
what is active transport?
A
the movement of dissolved molecules into or out of a cell through the cell membrane, from areas of lower concentration to areas of higher concentration.
2
Q
why does active transport use energy?
A
to transfer particles across the membrane
3
Q
what transfers molecules?
A
a transporter protein
4
Q
what does the transporter protein do
A
it changes the molecules’ shape and carries it across the membrane
5
Q
why doesn’t active transport have a concentration gradient?
A
concentration gradients are for passive methods of transport that don’t require energy
