What is the fundamental difference between carrier proteins that participate in facilitate diffusion and carrier proteins that function as pumps?

Answer 1

facilitated diffusion does not require energy, as it travels from a higher concentration gradient to a lower one(passive transport). Pumps do require energy to function(Active transport). This energy needed is ATP.

Answer 2

Transport proteins that are pumps differ from those that are channels in that when it pumps, it moves materials against concentration gradient. Other wise, from low to high concentration levels. Channels move materials down a concentration gradient, requiring no energy expenditure by the cell. From high concentration to low concentration levels.

Answer 3

Transport proteins that are pumps differ from those that are channels in that when it pumps, it moves materials against concentration gradient. Other wise, from low to high concentration levels. Channels move materials down a concentration gradient, requiring no energy expenditure by the cell. From high concentration to low concentration levels.

Answer 4

The most essential difference is that one is active (uses energy) and one is passive (doesn't require energy). Take note whenever you see the word 'active' in this context- it denotes that energy is required for it to occur, usually against the concentration gradient. Facilitated diffusion is just another passive process by which molecules move from an area of high concentration to low concentration. Note that this requires no energy to occur, except it differs from diffusion in that a carrier molecule is required (usually because the molecule is too large to freely cross the plasma membrane)

Answer 5

Carrier proteins in facilitated diffusion need a concentration gradient. For example if you need the ion A+ in a cell, then there has to be a lower concentration there then the media from which you extract it.

Carrier proteins that act as pumps are usually used when a higher concentration is for example in the cell as opposed to the media from which it is extracted. Also pumps act 2-ways (eg: Na+-K+ pumps), meaning as one ion is brought into the cell the other is expelled.

Answer 6

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