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Multiple Choice
What happens to the glucose molecule in the first step of glycolysis?
A
It is oxidized to form pyruvate.
B
It is cleaved into two molecules of glyceraldehyde-3-phosphate.
C
It is converted into fructose-1,6-bisphosphate.
D
It is phosphorylated to form glucose-6-phosphate.
Verified step by step guidance
1
Understand that glycolysis is the metabolic pathway that converts glucose into pyruvate, releasing energy and producing ATP.
Recognize that the first step of glycolysis involves the phosphorylation of glucose, which is crucial for trapping glucose inside the cell and preparing it for further breakdown.
Identify the enzyme responsible for this step: hexokinase. Hexokinase catalyzes the transfer of a phosphate group from ATP to glucose.
Write the chemical equation for this reaction:
Conclude that the glucose molecule is phosphorylated to form glucose-6-phosphate, which is the first step in glycolysis.