1. Tardigrade
  2. Question
  3. Biology
  4. Statement-I: Glycolysis is the first step of respiration in which glucose completely breaks into CO2 and H2O Statement-II: In this process, there is a net gain of twenty-four molecules of ATP.

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Q. Statement-I: Glycolysis is the first step of respiration in which glucose completely breaks into $CO_{2}$ and $H_{2}O$
Statement-II: In this process, there is a net gain of twenty-four molecules of $ATP.$

NTA AbhyasNTA Abhyas 2022

Solution:

Glycolysis / EMP pathway:
  1. Discovery: It is given by Embden, Meyerhoff, and Parnas in 1930. It is the first stage of the breakdown of glucose in the cell.
  2. Definition: Glycolysis (Gr. glykys= sweet, sugar; lysis= breaking) is a stepped process by which one molecule of glucose (6C) breaks into two molecules of pyruvic acid (3C).
  3. Site of occurrence: Glycolysis takes place in the cytosol and does not utilize oxygen. Thus, it is an anaerobic pathway. In fact, it occurs in both aerobic and anaerobic respiration.
Steps of glycolysis: Glycolysis consists of 10 steps divided into 2 phases preparatory phase and pay off phase. Each step is catalyzed by a specific enzyme. Most of the reactions are reversible.
Preparatory phase: In this phase, 2 molecules of ATP are utilized.
Pay-off phase: In this phase, energy is released in the form of ATP and NADH2 is formed.
8 ATP