The process is likely to involve active transport?

Question

If a molecules crosses a plasma membrane faster than it diffuses water, then the process is likely to involve active transport?

a. True

b. False

Answer 1

It is tempting to say "True" but there are other transport processes that can move the molecules faster than diffusion. This includes convective transport, or carrier-mediated transport, see the below article

http://www.brighthub.com/science/medical...

Facilitated transport (motor-assisted transport) can move large-scale molecules much faster than diffusion

http://www.brighthub.com/science/medical...

Answer 2

This is true...

Because if the diffusion is passive then the rate of passage of molecules is slow.

In active transport, specific molecules in the plasma membrane facilitate the transport of the foreign molecule inside the cell and hence enhance the rate at which it is transported inside.

Also active transport consumes energy (which is required for increasing the rate) where as passive transport does not.

Answer 3

True