Multiple Choice
In the context of transmembrane transport, which statement best describes how passive transport differs from active transport?
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9. Transport Across Membranes
Principles of Transmembrane Transport
Multiple Choice
In the context of principles of transmembrane transport, which type of cell transport requires an input of energy (e.g., ATP or an ion gradient) to move substances across a membrane?
A
Simple diffusion
B
Facilitated diffusion through a channel protein
C
Active transport
D
Osmosis
Verified step by step guidance1
Step 1: Understand the types of transmembrane transport mechanisms. These include simple diffusion, facilitated diffusion, osmosis, and active transport.
Step 2: Recall that simple diffusion and facilitated diffusion (through channel proteins) are passive processes, meaning they do not require energy input and substances move down their concentration gradient.
Step 3: Recognize that osmosis is a special case of passive transport involving the movement of water across a semipermeable membrane, also without energy input.
Step 4: Identify that active transport is the process that requires energy (such as ATP hydrolysis or energy stored in an ion gradient) to move substances against their concentration gradient across the membrane.
Step 5: Conclude that among the options, active transport is the only mechanism that requires an input of energy to move substances across the membrane.
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