Which one of the following is part of the preparatory phase of glycolysis? A)cleavage of a 6-carbon molecule into two 3-carbon molecules B)phosphorylation of a 6-carbon molecule C)reduction of NAD⁺ to NADH D)synthesis of ATP E)phosphorylation of a 3-carbon molecule

Question

Quizplus · Accepted Answer

The preparatory phase of glycolysis involves the phosphorylation of a 6-carbon molecule, glucose, to form glucose-6-phosphate. This step is catalyzed by the enzyme hexokinase or glucokinase, and it requires the input of an ATP molecule. Cleavage of a 6-carbon molecule into two 3-carbon molecules occurs in the second phase of glycolysis, known as the payoff phase. Reduction of NAD+ to NADH and synthesis of ATP also occur in the payoff phase, not the preparatory phase. Phosphorylation of a 3-carbon molecule is not part of the preparatory phase.

Which One of the Following Is Part of the Preparatory