Multiple Choice
Which process uses proteins to move molecules against a concentration gradient?
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6. The Membrane
Active Transport
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Does active transport require energy to move substances across a cell membrane?
A
Yes, it requires energy in the form of ATP.
B
Yes, but only when moving substances down their concentration gradient.
C
No, it occurs passively without energy.
D
No, it only requires energy when moving water molecules.
Verified step by step guidance1
Understand the concept of active transport: Active transport is the process by which cells move molecules across the cell membrane against their concentration gradient, from a region of lower concentration to a region of higher concentration.
Recognize the role of energy in active transport: Since active transport moves substances against their concentration gradient, it requires an input of energy.
Identify the source of energy: The energy required for active transport is typically provided by ATP (adenosine triphosphate), which is a molecule that stores and transfers energy within cells.
Differentiate between active and passive transport: Unlike passive transport, which does not require energy and moves substances down their concentration gradient, active transport requires energy to move substances against the gradient.
Conclude with the correct understanding: Active transport requires energy in the form of ATP to move substances across a cell membrane against their concentration gradient.
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