Textbook Question
Write a single sentence, using no more than 25 words, to summarize each of the following cellular processes:
Secondary active transport
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2. Cell Chemistry & Cell Components
Active Transport
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Why does active transport of molecules across a membrane require ATP?
A
Because it involves passive diffusion of molecules.
B
Because it moves molecules against their concentration gradient.
C
Because it moves molecules along their concentration gradient.
D
Because it relies on the natural kinetic energy of molecules.
Verified step by step guidance1
Understand the concept of concentration gradients: Molecules naturally move from areas of high concentration to areas of low concentration, a process known as passive diffusion.
Recognize that active transport is different from passive diffusion: Active transport moves molecules from areas of low concentration to areas of high concentration, which is against the natural concentration gradient.
Identify the energy requirement: Moving molecules against their concentration gradient requires energy because it is not a spontaneous process.
Learn the role of ATP in active transport: ATP (adenosine triphosphate) provides the necessary energy for active transport by undergoing hydrolysis, which releases energy.
Connect the concepts: Since active transport requires energy to move molecules against their concentration gradient, ATP is essential to provide this energy, distinguishing it from passive processes that do not require energy input.
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