Question:

What is the net gain of ATP when each molecule of glucose is converted to two molecules of pyruvic acid?

Updated On: May 2, 2025
  • Four
  • Six
  • Two
  • Eight
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The Correct Option is C

Solution and Explanation

To determine the net gain of ATP when one molecule of glucose is converted into two molecules of pyruvic acid, we need to analyze the process of glycolysis, which is the metabolic pathway responsible for this conversion. Glycolysis occurs in the cytoplasm of the cell and results in the breakdown of glucose (C₆H₁₂O₆) into two molecules of pyruvic acid (C₃H₄O₃). Let's break down the steps:
  • Initial Investment: Glycolysis begins with the consumption of 2 ATP molecules to help phosphorylate glucose and its derivatives. This is an energy investment phase.
  • Energy Payoff Phase: Later in the glycolysis pathway, 4 ATP molecules are produced through substrate-level phosphorylation, and 2 NADH molecules are generated by the dehydrogenation of intermediates.
  • Net Gain of ATP: Considering the ATP investment and payoff, the net gain of ATP is calculated as follows: 4 ATP produced - 2 ATP invested = 2 ATP.
The correct answer is: Two
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Respiration in plants is a process that entails the production of energy in plants. This process can simply be described as the intake of Oxygen and the release of Carbon Dioxide as an outcome of the oxidation of complex organic compounds. Though plants do not have any specific organ to balance the process of respiration, their stems, roots, and leaves do this work at a very low rate than other living beings. The process of respiration is very crucial for the plants to sustain the growth of the plant tissues.

This process can be stated as-

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