A) formation of ATP
B) ionization of water
C) attachment of \[C{{O}_{2}}\]to a pentose sugar
D) excitement of electron of chlorophyll by a photon of light
Correct Answer: C
Solution :
The first step in dark reaction of photosynthesis is carboxylation in which three molecules of \[C{{O}_{2}}\]combine with three molecules of ribulose 1, 5, biphosphate (RuBP) to form unstable six carbon compound. Carboxylation of RuBP is catalysed by the enzyme RuBF carboxyiase or Rubisco.
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