Multiple Choice
The force driving simple diffusion is ________, while the energy source for active transport is ________.
6. Cell Membrane & Transport
Active Transport
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How are primary and secondary active transport related?
A
They both use ATP to move molecules
B
Primary active transport establishes a concentration gradient, but secondary active transport doesn't
C
Secondary active transport uses the concentration gradient established by primary active transport
D
Primary active transport moves one molecule, but secondary active transport moves two
E
None of the above
Verified step by step guidance1
Understand the concept of active transport: Active transport is the process of moving molecules across a cell membrane against their concentration gradient, which requires energy.
Differentiate between primary and secondary active transport: Primary active transport directly uses energy from ATP to transport molecules, while secondary active transport uses the energy stored in the form of a concentration gradient established by primary active transport.
Identify the role of ATP in primary active transport: In primary active transport, ATP is hydrolyzed to provide the energy needed to move molecules against their concentration gradient.
Explain how secondary active transport works: Secondary active transport does not use ATP directly. Instead, it relies on the energy from the concentration gradient created by primary active transport to move other molecules across the membrane.
Relate the two processes: Primary active transport establishes a concentration gradient, which is then utilized by secondary active transport to move different molecules, often in a coupled manner, such as symport or antiport systems.
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Active Transport practice set
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