Question

Figure 10.3
-Referring to Figure 10.3, oxygen would inhibit the CO₂ fixation reactions in
A) cell I only. 
B) cell II only. 
C) neither cell I nor cell II. 
D) both cell I and cell II. 
E) cell I during the night and cell II during the day.

Accepted Answer

In Figure 10.3, we can see that cell II has special adaptations to minimize the amount of oxygen that reaches the CO₂ fixation reactions. Specifically, it has a C₄ carbon fixation pathway and bundle sheath cells that provide an extra barrier to prevent oxygen from reaching the CO₂ fixation enzyme (RuBisCO). Therefore, oxygen would inhibit the CO₂ fixation reactions in cell II only.

Figure 10.3-Referring to Figure 10.3, oxygen would inhibit the CO₂ fixation reactions in

Figure 10.3
-Referring to Figure 10.3, oxygen would inhibit the CO₂ fixation reactions in