A research team investigating the Calvin cycle in an isolated chloroplast suspension tracks the steady-state concentrations of ribulose-1,5-bisphosphate (RuBP) and 3-phosphoglycerate (3-PGA) under continuous illumination. When an experimental variable is altered suddenly, the concentration of 3-PGA surges sharply within seconds, accompanied by a rapid decrease in the concentration of RuBP. Based on the biochemical pathway of photosynthetic carbon fixation, which alteration best accounts for this observed shift?

A) Drastically decreasing the carbon dioxide concentration in the suspension medium

B) Selectively inhibiting the carboxylase activity of the enzyme RuBisCO

C) Elevating the temperature beyond the thermal denaturation point of RuBisCO

D) Abruptly extinguishing the light source while maintaining a continuous supply of carbon dioxide

Calvin cycle Transitional Reasoning Practice

Biology · Cellular Energetics · Biology · Photosynthesis

1 Biology practice questions on Calvin cycle. Questions that build towards applied reasoning.

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Cellular Energetics · Biology

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