Which of the Following Mechanisms of Membrane Transport Is Correctly

question 2

Multiple Choice

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

• A)simple diffusion: uses concentration gradient to move highly polar molecules and ions across membranes
• B)facilitated diffusion: uses proteins such as ion channels to move substances against their concentration gradient across a membrane
• C)primary active transport: uses ATP hydrolysis to move ions against their concentration gradient across a membrane
• D)secondary active transport: uses ATP hydrolysis along with an ion gradient to move polar molecules or ions against their concentration gradient across a membrane
• E)all of the above

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