Question:
Total number of ATP molecules utilised in one glycolytic pathway is _________.
Total number of ATP molecules utilised in one glycolytic pathway is _________.
Show Hint
Two ATP are spent in the investment phase of glycolysis.
Updated On: Nov 12, 2026
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The Correct Option is A
Solution and Explanation
Step 1: Understanding the Concept
Glycolysis has an energy investment phase in which ATP is spent twice.
Step 2: Count the ATP
Glucose to glucose-6-phosphate uses 1 ATP (hexokinase).
Fructose-6-phosphate to fructose-1,6-bisphosphate uses 1 more ATP (phosphofructokinase).
Step 3: Total
ATP used = 1 + 1 = 2. Four ATP are produced later, giving a net gain of 2.
Final Answer:
Two ATP molecules are utilised. \[ \boxed{\text{(A) }2} \]
Glycolysis has an energy investment phase in which ATP is spent twice.
Step 2: Count the ATP
Glucose to glucose-6-phosphate uses 1 ATP (hexokinase).
Fructose-6-phosphate to fructose-1,6-bisphosphate uses 1 more ATP (phosphofructokinase).
Step 3: Total
ATP used = 1 + 1 = 2. Four ATP are produced later, giving a net gain of 2.
Final Answer:
Two ATP molecules are utilised. \[ \boxed{\text{(A) }2} \]
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