Question

In anaerobic respiration, from one glucose molecule at how many steps ATP formation takes place?

• A. Two steps
• B. Four steps
• C. Single step
• D. Three steps

Hint:

ATP in anaerobic respiration is produced only during glycolysis via substrate-level phosphorylation.

Answer 1

The Correct Option is A

Step 1: Understanding anaerobic respiration.
Anaerobic respiration occurs in the absence of oxygen and mainly involves the process of glycolysis.
Step 2: ATP generation during glycolysis.
ATP is produced by substrate-level phosphorylation at two distinct steps during glycolysis.
Step 3: Analysis of options.
(A) Two steps: Correct — ATP formation occurs at two steps in glycolysis.
(B) Four steps: Incorrect — ATP is consumed at some steps.
(C) Single step: Incorrect — ATP is formed more than once.
(D) Three steps: Incorrect — only two ATP-generating steps exist.
Step 4: Conclusion.
In anaerobic respiration, ATP formation from one glucose molecule takes place at two steps.