Which of the following mechanisms of membrane transport is correctly defined?

Question

Quizplus · Accepted Answer

Primary active transport is defined as the use of ATP hydrolysis to move molecules or ions against their concentration gradient across a membrane. Simple diffusion is the process in which molecules move from an area of high concentration to an area of low concentration down their concentration gradient without the need for a membrane transporter. Facilitated diffusion involves the use of membrane proteins to transport molecules or ions down their concentration gradient. Secondary active transport involves the use of an existing ion gradient to transport other molecules or ions against their concentration gradient, but does not involve the direct hydrolysis of ATP. Therefore, only C is the correct definition.

Which of the Following Mechanisms of Membrane Transport Is Correctly