Question

Which of the following criteria does not pertain to facilitated transport?

• A. requirement of special membrane proteins
• B. uphill transport
• C. high selectivity
• D. transport saturation

Answer 1

The correct option is B

uphill transport

The correct option is B.

Explanation of correct option:

1. A method that permits molecules to migrate from a higher concentration zone to a lower concentration zone along a concentration gradient is known as facilitated transport.
2. The uphill transfer is the movement of substances from a lower concentration to a higher concentration.
3. A sort of assisted transfer is passive-mediated transport, also known as facilitated diffusion.

Explanation of incorrect options:

Option (A):

1. Protein carriers are another type of trans membrane integral protein.
2. Downhill transport is defined as passive movement that does not require the expenditure of ATP or resources and happens down a concentration gradient, i.e. from a higher concentration region to a lower concentration area.

Option (C):

1. Because carrier proteins are involved in the transfer of any specific molecule or ion, facilitative transport is highly selective.
2. Transmembrane integral proteins are sometimes known as channel proteins or carrier proteins.

Option (D):

1. These proteins are only exposed to one side of the membrane at a time.
2. These proteins bind to molecules or ions and change their shape in order to transport them across the plasma membrane.

Final Answer: Uphill transport does not pertain to facilitated transport.