krebs cycle n slck n hatch pthway

Krebs’s cycle is also known as citric acid cycle or tricarboxylic acid cycle. It is next step of glycolysis to yield energy. Kreb’s cycle occurs in all aerobic organisms where the acetate derived from carbohydrates, fats and proteins is oxidized to carbon dioxide and yields energy in the form of ATP. The overall reaction of Kreb’s cycle is:
Acetyl CoA + 3NAD + FAD + ADP + HPO42-→ 2CO2 + CoA + 3 NADH+ + FADH+ + ATP
Hatch and Slack pathway is a cycle of carbon fixation in plants growing in the regions where temperatures are quite high. When the temperatures are high oxygenase activity of RuBISCO increases and leads to photorespiration which is a futile process. In order to prevent this Hatch and Slack pathway evolved.  In Hatch and Slack pathway which is also known as C4 pathway carbon dioxide first adds to phosphoenol pyruvate in a reaction catalyzed by PEP Carboxylase and this reaction produces oxalo acetic acid  in mesophyll cells which then later is transported to the bundle sheath cells and carbon dioxide is liberated for later use in Calvin cycle.

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