Multiple Choice
Which of the following is a form of active transmembrane transport (requires energy input)?
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9. Transport Across Membranes
Principles of Transmembrane Transport
Multiple Choice
In the principles of transmembrane transport, what type of energy is typically required to drive primary active transport across a membrane against an electrochemical gradient?
A
Light energy absorbed by membrane pigments in all animal cells
B
Energy released by solute moving down its concentration gradient (secondary active transport only)
C
Thermal energy from random molecular motion (diffusion)
D
Energy from ATP hydrolysis
Verified step by step guidance1
Understand that primary active transport involves moving molecules across a membrane against their electrochemical gradient, which requires an input of energy.
Recognize that this energy cannot come from passive processes like diffusion or from energy released by solutes moving down their gradients, which are involved in secondary active transport or passive transport.
Recall that in most cells, the energy for primary active transport is provided by the hydrolysis of ATP, a process that releases chemical energy.
Note that light energy absorbed by membrane pigments is not typically used in animal cells for primary active transport; this is more relevant in photosynthetic organisms.
Conclude that the type of energy required to drive primary active transport is the chemical energy derived from ATP hydrolysis.
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