Questions: Referring to the accompanying figure, where would elevated concentrations of oxygen inhibit carbon fixation reactions? cell I only both cell I and cell II cell II only neither cell nor cell II

Referring to the accompanying figure, where would elevated concentrations of oxygen inhibit carbon fixation reactions? cell I only both cell I and cell II cell II only neither cell nor cell II
Transcript text: Referring to the accompanying figure, where would elevated concentrations of oxygen inhibit carbon fixation reactions? cell I only both cell I and cell II cell II only neither cell nor cell II
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Solution

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Solution Steps

Step 1: Analyze the provided diagram

Cell I shows a C4 pathway, where CO2 is initially fixed into a 4-carbon compound (oxaloacetic acid). Cell II shows the Calvin cycle (C3 pathway) where CO2 is fixed by RuBP to produce phosphoglycerate.

Step 2: Identify where oxygen inhibits carbon fixation

Oxygen inhibits carbon fixation in the Calvin cycle (C3 pathway) through photorespiration, where RuBP reacts with O2 instead of CO2. This occurs in Cell II.

Final Answer: The answer is cell II only.

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