The movement of matter across a cell membrane against a concentration difference is called active transport and it requires energy often in the form of ATP.
There are two types of transports across a cell membrane:
Passive transports involve the movement of materials across the cell membrane from the region of higher to the region of lower concentration. It can occur by simple or facilitated diffusion and does not involve the expedition of energy in any form.
Active transport involves the movement of materials across the cell membrane from the region of lower to the region of higher concentration. It requires the expedition of energy, usually in the form of ATP.
More on cellular transportation can be found here: https://brainly.com/question/17128226
