Question

c4 pathway is also called as decarboxylation pathway because​

Answer 1

Answer:

A metabolic pathway where CO2 is first added to phosphoenolpyruvate by the enzyme, PEP carboxylase, producing the four-carbon compound within mesophyll cells that is later transported to the bundle sheath cells where the CO2 is to be released for use in the Calvin cycle

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Answer 2

Answer:

C4 pathway is also called decarboxylation pathways

Explanation:

• A plant that utilizes the C4 carbon fixation pathway in which the CO2 is first bound to a phosphoenolpyruvate in mesophyll cell resulting in the formation of four-carbon compound (oxaloacetate) that is shuttled to the bundle sheath cell where it will be decarboxylated to liberate the CO2 to be utilized in the C3 pathway.
• A plant in which the CO2 is first fixed into a compound containing four carbon atoms before entering the Calvin cycle of photosynthesis.
• In the C4 Cycle, or otherwise known as Krebs Cycle, begins with the compound Acetate (C2)+Coenzyme A, Acetyl CoA)and Oxaloacetate(C4) which binds together to form Citrate(C6) with the help of coenzyme A(exits the cycle).
• Next, decarboxylation occurs and 1 C is removed to form carbon dioxide and 1 molecule of NADH is formed, while the rest C5 remains in the cycle.
• Decarboxylation occurs again and another carbon dioxide molecule is formed with another NADH molecule.
• After a complexed process, C4 remains but 1 NADH, 1 FADH2 and 1 ATP molecule is formed. Since this only applies to 1 acetyl coA molecule and there are 2, multiply this process by 2.
• Thus, in the Krebs Cycle, there are in total 6 NADH, 2 FADH2 and 2ATP produced. (ATP of 2).
• Photosynthesis is a process that uses water, carbon dioxide (CO2) and solar energy to synthesize sugars. It is carried out by many plants, algae and bacteria.
• In plants and algae, photosynthesis occurs in special parts of the cell called chloroplasts; located in the leaves and stems. Whereas most plants perform what is known as C3 photosynthesis, plants that have adapted to hot environments perform a modified form known as C4 photosynthesis.
• C4 PHOTOSYNTHESIS :- In this type of photosynthesis environmental CO2 is first incorporated into 4-carbon acids in cells known as mesophylls.
• These acids are transported to other cells known as bundle sheath cells. In these cells, the reaction is reversed, CO2 is released and subsequently used in the normal (C3) photosynthetic pathway.
• The incorporation of CO2 into 3-carbon compounds is catalyzed by an enzyme known as Rubisco.