Question:
How many ATP molecules are utilized in the glycolysis of a glucose molecule?
How many ATP molecules are utilized in the glycolysis of a glucose molecule?
Show Hint
Count the ATP used in the preparatory phase.
Updated On: Nov 12, 2026
- \(8\)
- \(6\)
- \(4\)
- \(2\)
Show Solution
Verified By Collegedunia
The Correct Option is D
Solution and Explanation
Step 1: Understanding the Concept
Glycolysis spends ATP only in its preparatory phase.
Step 2: Count
Glucose to glucose 6-phosphate (hexokinase) uses 1 ATP. Fructose 6-phosphate to fructose 1,6-bisphosphate (phosphofructokinase) uses 1 ATP.
Step 3: Total
ATP used is \(1 + 1 = 2\). The later steps produce 4 ATP, a net gain of 2.
Final Answer:
2 ATP molecules are utilised. \[ \boxed{\text{(D) }2} \]
Glycolysis spends ATP only in its preparatory phase.
Step 2: Count
Glucose to glucose 6-phosphate (hexokinase) uses 1 ATP. Fructose 6-phosphate to fructose 1,6-bisphosphate (phosphofructokinase) uses 1 ATP.
Step 3: Total
ATP used is \(1 + 1 = 2\). The later steps produce 4 ATP, a net gain of 2.
Final Answer:
2 ATP molecules are utilised. \[ \boxed{\text{(D) }2} \]
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