Multiple Choice
Which of the following processes represents active transport?
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6. The Membrane
Active Transport
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Which process uses proteins to move molecules against a concentration gradient?
A
Facilitated Diffusion
B
Active Transport
C
Osmosis
D
Passive Transport
Verified step by step guidance1
Understand the concept of concentration gradient: A concentration gradient occurs when there is a difference in the concentration of a substance across a space or a membrane.
Recognize the types of transport: Passive transport (including facilitated diffusion and osmosis) moves molecules down their concentration gradient without energy input, while active transport moves molecules against their concentration gradient and requires energy.
Identify the role of proteins in transport: In facilitated diffusion, proteins help move molecules across the membrane without energy, while in active transport, proteins (often called pumps) use energy to move molecules against the gradient.
Clarify the energy requirement: Active transport requires energy, usually in the form of ATP, to move molecules against the concentration gradient, unlike passive transport processes.
Conclude that active transport is the process that uses proteins to move molecules against a concentration gradient, distinguishing it from facilitated diffusion, osmosis, and passive transport.
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