A Levels Biology (9700)•9700/13/M/J/18

Explanation
ATP powers endergonic cellular processes
Steps:
- Recall ATP hydrolysis provides energy for reactions where ΔG > 0.
- Evaluate process 1: active transport requires ATP to move ions against concentration gradients.
- Evaluate process 2: anabolic synthesis (e.g., protein building) uses ATP to drive bond formation.
- Evaluate process 3: cellular respiration generates ATP through catabolic breakdown, not consumption.
Why B is correct:
- Processes 1 and 2 are endergonic and directly hydrolyze ATP, as defined in bioenergetics.
Why the others are wrong:
- A includes 3, but respiration produces ATP via electron transport chain.
- C includes 3 but omits 2, ignoring ATP's role in biosynthesis.
- D includes 3 but omits 1, overlooking ATP in membrane transport.
Final answer: B
Topic: Energy
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