Waec Model Questions Vol1 2019 Biology Question 50
Practice objective / multiple choice question 50 from the 2019 Waec Model Questions Vol1 Biology examination.
In root cells of a plant, nitrate (NO₃⁻) is taken up by a H⁺/NO₃⁻ symporter that transports 1 nitrate ion together with 2 protons into the cell per cycle. The proton gradient that drives this symport is generated by a H⁺‑ATPase which hydrolyses one ATP molecule to pump 3 protons out of the cell. If a root cell must accumulate 6 nitrate ions from the soil, how many ATP molecules must be hydrolysed, assuming the proton gradient is the only energy source and that protons are recycled perfectly after each symport event? Give your answer as an integer.
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About This Question
This is Waec Model Questions Vol1 2019 Biology Question 50. It is one of the objective questions from the 2019 Waec Model Questions Vol1 Biology examination.
Difficulty level: Medium .
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