Which molecule does RuBisCO have a greater affinity for when the CO2: O2 ratio is nearly equal?

Step-by-step solution

Let us try and understand one more process that creates an important difference between C3 and C4 plants – Photorespiration. To understand photorespiration we have to know a little bit more about the first step of the Calvin pathway – the first CO2 fixation step. This is the reaction where RuBP combines with CO2 to form 2 molecules of 3PGA, that is catalysed by RuBisCO. RuBisCO that is the most abundant enzyme in the world is characterised by the fact that its active site can bind to both CO2 and O2 – hence the nam