First slide

Means of Transport

Question

Which of the following transport across the cell needs ATP and is affected by protein inhibitors?

Easy

A

Simple diffusion
B

Facilitated diffusion
C

Active transport
D

Osmosis

Solution

In facilitated diffusion special proteins help move substances across membranes without expenditure of ATP energy. Facilitated diffusion cannot cause net transport of molecules from a low to a high concentration – this would require input of energy. Active transport used energy usually in the form of ATP for uphill transport.

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