Question

question 20. during photosynthesis, the enzyme ribulose bisphosphate carboxylase, rubisco, breaks the carbon - to - oxygen bonds in carbon dioxide and reconnects them in the carbon - to - carbon bonds for sugar and temperature. what do the graphs indicate about the optimum temperature and ph for rubisco? a. rubisco works best at temperatures above 40°c with a ph less than 7 b. rubisco works best between 35°c and 39°c with a ph equal to 7 c. rubisco works best at temperatures above 40°c with a ph equal to 7 d. rubisco works best between 35°c and 39°c with a ph greater than 7

Explanation:

• Analyze each option:
• Option A: The graph shows that at temperatures above \(40^{\circ}C\), enzyme activity is low, so RuBisCo does not work best at temperatures above \(40^{\circ}C\) with a pH less than 7.
• Option B: The graph shows that the optimal pH for RuBisCo is around 7 (enzyme activity is highest at this pH range), and the optimal temperature range is \(35 - 39^{\circ}C\).
• Option C: At temperatures above \(40^{\circ}C\), enzyme activity is low, so RuBisCo does not work best at temperatures above \(40^{\circ}C\) with a pH equal to 7.
• Option D: The graph shows that the optimal pH for RuBisCo is around 7 (not greater than 7), and the optimal temperature range is \(35 - 39^{\circ}C\).

Answer:

B. RuBisCo works best between \(35^{\circ}C\) and \(39^{\circ}C\) with a pH equal to 7.