Multiple Choice
Which of the following classes of ATP-drive pumps can synthesize ATP when reversed?
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9. Transport Across Membranes
Transporters
Multiple Choice
Which process is a form of passive transport that uses membrane transport proteins to move solutes down their concentration gradient without ATP?
A
Primary active transport
B
Facilitated diffusion
C
Secondary active transport (cotransport)
D
Endocytosis
Verified step by step guidance1
Understand the definition of passive transport: it is the movement of molecules across a cell membrane without the use of cellular energy (ATP), typically down their concentration gradient.
Recall that facilitated diffusion is a type of passive transport where specific membrane transport proteins (such as channel or carrier proteins) help solutes move across the membrane without ATP.
Differentiate facilitated diffusion from primary active transport, which requires ATP to move solutes against their concentration gradient.
Recognize that secondary active transport (cotransport) uses the energy stored in the gradient of one molecule to drive the transport of another molecule against its gradient, indirectly using energy.
Note that endocytosis is an energy-dependent process involving the engulfing of large particles or fluids by the cell membrane, not a form of passive transport.
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