Multiple Choice
Which of the following describes an aspect of active transport?
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6. The Membrane
Active Transport
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Which statement best describes active transport?
A
Active transport occurs only in the presence of a concentration gradient.
B
Active transport is a form of diffusion that does not require energy.
C
Active transport involves the passive movement of substances along their concentration gradient.
D
Active transport requires energy to move substances against their concentration gradient.
Verified step by step guidance1
Understand the concept of active transport: Active transport is a biological process where 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 energy requirement: Unlike passive transport, active transport requires energy, usually in the form of ATP, to move substances against the concentration gradient.
Identify the role of transport proteins: Active transport often involves specific transport proteins embedded in the cell membrane, such as pumps, that facilitate the movement of molecules.
Distinguish from passive transport: Passive transport, such as diffusion and osmosis, does not require energy and occurs along the concentration gradient, whereas active transport requires energy to move substances against the gradient.
Apply this understanding to the given statements: Evaluate each statement based on the characteristics of active transport, identifying the correct description as the one that mentions the requirement of energy to move substances against their concentration gradient.
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