How Does Introducing a Competitive Inhibitor of Rubisco Affect Photosynthesis?

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Introducing a competitive inhibitor of rubisco in chloroplasts affects photosynthesis by potentially slowing down the light reactions due to limited availability of substrates for the Calvin cycle. The discussion highlights confusion regarding whether the light reactions would slow down because of scarce electron carriers or the presence of O2. Participants seek clarification on rubisco's role, questioning if it functions as an electron carrier or influences their concentration. The impact of O2 on the light reactions is also debated, with uncertainty about whether they speed up or slow down in its presence. Overall, the conversation centers on understanding the consequences of competitive inhibition on photosynthetic processes.
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Homework Statement


Suppose that a competitive inhibitor of rubisco is introduced into chloroplasts. Which of the following statements is a logical consequence:
(a) The light reactions will slow down, since electron carriers will be scarce.
(b) The light reactions will speed up to drive the Calvin cycle forward.
(c) Photorespiration will occur in the chloroplasts.
(d) The light reactions will slow down, since O2 will be scarce.
(e) The Calvin Cycle will remain unaffected.


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The Attempt at a Solution


At first I thought competitive inhibition would slow down the process of photosynthesis significantly, but now I am not sure. Even so, the answer can either be (a) or (d). Help please! Thank you
 
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What is ribulose-1,5-bisphosphate carboxylase/oxygenase's role in the chloroplast? Is it an electron carrier or does it modulate the concentration of an electron carrier? Do light reactions speed up in the presence of O2 or slow down in the absence of O2?
 
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