Question

How does a pump differ from a channel or a carrier? View available hint(s) how does a pump differ from a channel or a carrier? Pumps are proteins but channels and carriers are formed by a special arrangement of phospholipids and cholesterol. Pumps are integral membrane proteins while channels and carriers are peripheral membrane proteins. Pumps require energy for transport, but channels and carriers do not use energy. Pumps cannot create a concentration gradient but channels and carriers can?

Answer 1

Answer;

-Pumps require energy for transport because they move material against an electrochemical gradient, but channels and carriers do not use energy because they only facilitate diffusion down a molecule's or ion's electrochemical gradient.

Explanation;

-Permeability is conferred by two classes of membrane proteins, pumps and channels. Pumps use a source of free energy such as ATP or light to drive the thermodynamically uphill transport of ions or molecules. Pump action is an example of active transport.

-Channels, in contrast, enable ions to flow rapidly through membranes in a downhill direction. Channel action illustrates passive transport, or facilitated diffusion.