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During the process of respiration. how many oxygen molecules combine with one molecule of glucose?
Question

During the process of respiration. how many oxygen molecules combine with one molecule of glucose?

A.

Five

B.

Four

C.

Six

D.

Seven

Correct option is C

The correct answer is:(C) Six.​
Explanation:
Cellular respiration is a biochemical process in which glucose (C₆H₁₂O₆) is broken down in the presence of oxygen (O₂) to produce energy (ATP), carbon dioxide (CO₂), and water (H₂O).
The balanced chemical equation for aerobic respiration is:C6H12O6+6O26CO2+6H2O+energyC_6H_{12}O_6+6O_2→6CO_2+6H_2O+\text{energy}
This equation shows that one molecule of glucose (C₆H₁₂O₆) requires six molecules of oxygen (O₂) to undergo complete oxidation.
The energy produced in this process is stored as ATP (Adenosine Triphosphate), which is used for various biological activities.
The end products of this reaction are carbon dioxide (CO₂) and water (H₂O).
Information booster:
  • Aerobic respiration occurs in the mitochondria and requires oxygen.
  • 36-38 ATP molecules are produced per glucose molecule in aerobic respiration.
  • Anaerobic respiration, occurring in the absence of oxygen, produces less energy and results in products like lactic acid (in animals) or ethanol and CO₂ (in yeast).
  • Glycolysis is the first step of respiration, occurring in the cytoplasm, while the Krebs cycle and Electron Transport Chain (ETC) take place in the mitochondria.
  • The electron transport chain (ETC) plays a major role in ATP synthesis by utilizing the energy from electrons transferred by NADH and FADH₂.
  • Mitochondria are called the powerhouse of the cell because they generate ATP through cellular respiration.

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