Why is RuBisCo more appropriately called RUBP carboxylase - oxygenase and what important role does it play in photosynthesis - Biology - Photosynthesis in Higher Plants

Question

Why is RuBisCo more appropriately called RUBP carboxylase -
oxygenase and what important role does it play in
photosynthesis

Sarina Biswas · Accepted Answer

RuBisCo is appropriately called RUBP carboxylase - oxygenase
because the 
enzyme catalyses the carboxylation (the chemical process by which a
carboxyl group -COOH is added) of 
ribulose-1,5-bisphosphate, RuBP, a
5-carbon compound, by carbon dioxide (a total of 6 carbons) in a
two-step reaction Sometimes the magnesium metal center of
Rubisco coordinates to RuBP and oxygen instead of carbon dioxide
Rubisco then catalyzes an oxygenase reaction Under normal
conditions the rate of the carboxylase reaction is 4 times faster
than the oxygenase reaction

Role of Rubisco is the enzyme that attaches each carbon dioxide
molecule to a molecule of ribulose biphosphate 
It provides acceptor molecules
that consume the products of the light reactions of photosynthesis,
and regulates the pool sizes of important photosynthetic
intermediates

Why is RuBisCo more appropriately called RUBP carboxylase - oxygenase and what important role does it play in photosynthesis.