does active transport use celluar energy?

Question

dont go all fancy on me this is grade 8 science

Answer 1

Yes. Passive transport is like diffusion and occurs merely by having a gradient (different concentrations of solutions). Active transport requires energy to form the kinds of chemical species that can cross a barrier (like a membrane).

Answer 2

By definition it requires energy.

As you know, the spotaneous process, that doesn't require energy, is for molecules to move from regions where their concentration is high to regions where their concentration is low. The reverse requires energy.

Cells have different types of molecules inside them, like sodium ions (Na+) and potassium ions (K+). The concentration of Na+ is usually higher outside the cell. Thus a Na+ will be transported in the cell without requiring energy (passive transport). For K+, it is the opposite. There is more K+ in the cell than in its environment and therefore if you opened a hole in the membrane the spontaneous thing would be for K+ to leave the cell. Therefore, if the cell wants to import K+, it cannot simply open a channel (that would result in K+ going out) but has to use a pump, which of course requires energy to work (active transport).

Active transport is defined as the transport of molecules uphill their gradient,ie from the lower concentration to higher and thus requires energy.

Answer 3

the service proteins in energetic transport use ATP's as power source. those are the products of respiratory in cells' mitochondria. wish that enables P.S forgot to characteristic, ATP stands for Adenosine triphosphate

Answer 4

Yes it does. Is that simple enough for you?