Question:
The first step in glycolysis is:
The first step in glycolysis is:
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Step 1 "invests" energy—think of adding a phosphate as "locking the door" so the sugar can't leave the cell.
Updated On: May 5, 2026
- Phosphorylation of glucose
- Formation of fructose-6-phosphate
- Formation of PGAL
- Pyruvate formation
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The Correct Option is A
Solution and Explanation
Step 1: Concept
Glycolysis is the metabolic pathway that breaks down glucose into pyruvate to produce energy in the form of ATP.
Step 2: Meaning
Phosphorylation refers to the addition of a phosphate group to a molecule, typically utilizing ATP.
Step 3: Analysis
To begin the process and trap the glucose molecule inside the cell, an enzyme called hexokinase adds a phosphate group to the sixth carbon of glucose. This converts glucose into glucose-6-phosphate.
Step 4: Conclusion
Since the very first reaction involves the addition of a phosphate to glucose, the correct answer is phosphorylation of glucose. Final Answer: (A)
Glycolysis is the metabolic pathway that breaks down glucose into pyruvate to produce energy in the form of ATP.
Step 2: Meaning
Phosphorylation refers to the addition of a phosphate group to a molecule, typically utilizing ATP.
Step 3: Analysis
To begin the process and trap the glucose molecule inside the cell, an enzyme called hexokinase adds a phosphate group to the sixth carbon of glucose. This converts glucose into glucose-6-phosphate.
Step 4: Conclusion
Since the very first reaction involves the addition of a phosphate to glucose, the correct answer is phosphorylation of glucose. Final Answer: (A)
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