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tensa zangetsu [6.8K]
3 years ago
7

What is a major difference between facilitated diffusion and active transport?

Biology
1 answer:
Novay_Z [31]3 years ago
8 0

Answer:

Major difference between active transport and facilitated difusion is:

Active transport moves substances against the concentration gradient.

Facilitated diffusion moves molecules through the plasma membrane.

Explanation:

  • Active transport involves the transport of molecules against the concentration gradient.
  • Since molecules move from lower concentration to higher concentration this mode of transport needs energy.
  • Facilitated diffusion do not require energy  but need some other molecule or carrier protein to transport the molecules across the membranes.
  • In facilitated diffusion, the molecules move from their region of higher concentration to the region of lower concentration.
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In which case would facilitated diffusion be needed?
Novay_Z [31]

Answer:

The case in which facilitated diffusion would be needed is in the transport of large non-polar molecules moving down the concentration gradient.

Explanation:

Facilitated diffusion (FD) involves a form of passive transport, that is, it does not require energy and mobilizes substances across the cell membrane in favor of a concentration gradient.

The passive transport mechanism of FD is necessary only in the case of transport of very large molecules or polar molecules that:

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  • They follow a concentration gradient, from the place with the highest concentration to the one with the lowest concentration.

For FD to occur, it requires the use of a protein, which acts as a carrier of the molecules to be mobilized.

The other options are not correct because:

<em>     A and C. Passive transport, as facilited diffusion,  implies movement in favor of a concentration gradient.</em>

<em>     B and C. Non-polar small or very small molecules can cross the membrane by simple diffusion.</em>

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