Question

Study the comparison of different transport mechanisms to pick out the correct pair in the following format: 

 

• A.
• B.
• C.
• D.

Hint:

In active transport, energy is used to move substances against their concentration gradient, while in facilitated transport, substances move down their concentration gradient via membrane proteins.

Answer 1

The Correct Option is B

Requires ATP energy:

• Simple Diffusion: No (This is a passive process and does not require ATP).
• Facilitated Transport: Yes (This process requires energy from ATP but not directly).
• Active Transport: Yes (This process uses ATP to transport molecules against their concentration gradient).

Uphill transport:

• Simple Diffusion: No (This type of transport occurs along the concentration gradient).
• Facilitated Transport: No (This also occurs along the concentration gradient).
• Active Transport: Yes (Active transport moves molecules against their concentration gradient, considered as "uphill" transport).

Transport saturation:

• Simple Diffusion: Yes (At higher concentrations, the rate of diffusion reaches a maximum, i.e., it can saturate).
• Facilitated Transport: No (This mechanism does not saturate in the same way).
• Active Transport: No (While active transport has a maximum rate, it does not exhibit saturation like diffusion).

Require special membrane proteins:

• Simple Diffusion: No (Simple diffusion does not require special proteins; it occurs through the lipid bilayer).
• Facilitated Transport: Yes (Facilitated transport requires specific carrier or channel proteins).
• Active Transport: Yes (Active transport also requires special pump proteins for the transport of molecules).

Thus, the correct pair from the options is Uphill transport for active transport.