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
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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
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