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Revision: Plant Physiology >> Respiration in Plants Biology (English Medium) ICSE Class 9 CISCE

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Definitions [3]

Definition: Glycolysis

The process occurring in the cytoplasm where one glucose molecule is stepwise oxidized to form two molecules each of pyruvic acid, ATP, NADH₂, and water is called glycolysis.

Definition: Tricarboxylic Acid Cycle (Citric Acid Cycle or Kreb’s Cycle)

The cyclic series of reactions occurring in the mitochondria, where acetyl-CoA is completely oxidized to produce CO₂, H₂O, NADH₂, and FADH₂, is called the tricarboxylic acid cycle or Krebs cycle.

Definition: ATP

A molecule made up of adenine, ribose sugar, and three phosphate groups, which stores and releases energy by breaking phosphate bonds for cellular activities, is called adenosine triphosphate (ATP).

 

Key Points

Key Points: ATP
  • ATP (Adenosine Triphosphate) is the energy currency of the cell, storing energy in its phosphate bonds and releasing it when needed.
  • ATP consists of adenine, ribose, and three phosphate groups, and is formed in cells to meet energy demands.
  • When carbohydrates are lacking, the body uses lipids and proteins, which are converted into acetyl-CoA and oxidized via the Krebs cycle for energy.
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