4
Question
The first reaction in photorespiration is
The first reaction in photorespiration is
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Solution
The correct option is C Oxygenation.
The enzyme RuBP carboxylase/oxygenase (RuBisCO) catalyzes CO2 fixation in the Calvin cycle by attaching CO2 to RuBP. As its full name implies, RuBisCO acts not only as a carboxylase but also as an oxygenase because, high levels of O2 compete with CO2 for the active site of RuBisCO. This process is called photorespiration, because it occurs in the presence of light; and as in aerobic respiration, it requires oxygen and produces CO2 and H2O. However, photorespiration does not produce ATP, and it reduces photosynthetic efficiency, because it removes some of the intermediates used in the Calvin cycle. The first reaction of this pathway is oxygen fixing reaction, which produces 2 phoshpoglycolate and 3 phosphoglyceric acid. This reaction occurs in the chloroplast.
The enzyme RuBP carboxylase/oxygenase (RuBisCO) catalyzes CO2 fixation in the Calvin cycle by attaching CO2 to RuBP. As its full name implies, RuBisCO acts not only as a carboxylase but also as an oxygenase because, high levels of O2 compete with CO2 for the active site of RuBisCO. This process is called photorespiration, because it occurs in the presence of light; and as in aerobic respiration, it requires oxygen and produces CO2 and H2O. However, photorespiration does not produce ATP, and it reduces photosynthetic efficiency, because it removes some of the intermediates used in the Calvin cycle. The first reaction of this pathway is oxygen fixing reaction, which produces 2 phoshpoglycolate and 3 phosphoglyceric acid. This reaction occurs in the chloroplast.
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