Multiple Choice
Transporters always require energy to move solutes across a membrane?
9. Transport Across Membranes
Transporters
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Which of the following is not considered a transporter?
A
V ATP pump
B
Light driven pumps
C
Coupled pumps
D
Ion channels
Verified step by step guidance1
Understand the role of transporters in cell biology. Transporters are proteins that facilitate the movement of ions, molecules, or substances across cell membranes.
Identify the types of transporters mentioned: V ATP pumps, light-driven pumps, and coupled pumps. These are all mechanisms that actively transport substances across membranes.
Recognize that ion channels are different from transporters. Ion channels allow ions to passively flow through the membrane without the need for energy input, unlike transporters which often require energy.
Consider the mechanism of ion channels. They open or close in response to specific signals, allowing ions to move down their concentration gradient, which is a passive process.
Conclude that ion channels are not considered transporters because they do not actively transport substances against their concentration gradient, unlike the other options listed.
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