IB Biology SL C1.2 Cell respiration questions

Exam-style multiple choice and written questions with full markschemes. Check multiple choice answers straight away, or type, photograph or draw a written answer and get it marked.

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Question 1

Multiple choiceHard1 mark

The schematic shows solute transfer between equal-sized compartments and two interconversions of ATP. Which interpretation correctly describes the energy transfers?

Compartment 1Compartment 2solute movementtransport proteinATPADP + phosphateXY
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Answer: D. The solute moves from a compartment with fewer particles to an equal-sized compartment with more particles, so it moves against the concentration gradient and requires energy. At X, ATP is hydrolysed to ADP and phosphate, releasing energy that can drive this transport. At Y, ATP is synthesized from ADP and phosphate, which requires an energy input.
A: reverses the energy changes for both ATP hydrolysis and ATP synthesis.
B: correctly identifies energy release at X but reverses the energy requirement for ATP synthesis.
C: correctly identifies the energy input for ATP synthesis but treats ATP hydrolysis as requiring energy input.
Remember: ATP hydrolysis releases energy; ATP synthesis requires energy.

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