20 CO₂ are generated during the full oxidation of one glucose molecule.
A cytoplasmic mechanism called glycolysis converts glucose into two molecules with three carbons each and releases energy. Hexokinase, a phosphorylating enzyme, assists in the phosphorylation process that traps glucose.
The second stage of cellular respiration, a three-step process by which living cells break down organic fuel molecules in the presence of oxygen to obtain the energy they require to grow and divide, is known as the tricarboxylic acid cycle, also known as the Krebs cycle and the citric acid cycle.
1 glucose molecule is responsible for the release of 4 CO2 molecules during Krebs cycle.
Thus, 5 molecules of glucose will release 5× 4 = 20 molecules of CO₂.
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