Aerobic respiratory pathway is appropriately termed: [2009]a)parabolicb)amphibolicc)anabolicd)catabolicCorrect answer is option 'B'. Can you explain this answer?

Question

Answer

Aerobic  respiration is both an anabolic and catabolic reaction .A reaction which is both catabolic and anabolic  is called amphibolic reaction. there for option B

Answer

Answer

Aerobic respiratory pathway is appropriately termed: [2009]

The correct answer is option 'B', which is 'amphibolic'. Let's understand why this term is appropriate for the aerobic respiratory pathway.

Definition of Amphibolic pathway:
An amphibolic pathway is a metabolic pathway that has both catabolic and anabolic functions. It means that the pathway can both break down (catabolize) and build up (anabolize) molecules.

The Aerobic Respiratory Pathway:
The aerobic respiratory pathway is a process that occurs in the presence of oxygen and involves the breakdown of glucose or other organic molecules to produce energy in the form of ATP. This pathway takes place in the mitochondria and consists of three main stages: glycolysis, the citric acid cycle (also known as the Krebs cycle), and oxidative phosphorylation.

1. Glycolysis:
Glycolysis is the initial step of the aerobic respiratory pathway. In this process, glucose is broken down into two molecules of pyruvate, producing a small amount of ATP and NADH. Glycolysis is a catabolic process as it involves the breakdown of glucose molecules to release energy.

2. Citric Acid Cycle (Krebs Cycle):
The citric acid cycle occurs in the mitochondria and is an important part of the aerobic respiratory pathway. In this cycle, the two molecules of pyruvate produced during glycolysis are further broken down to generate ATP, NADH, and FADH2. The citric acid cycle is also a catabolic process as it breaks down molecules to produce energy.

3. Oxidative Phosphorylation:
Oxidative phosphorylation is the final stage of the aerobic respiratory pathway. It takes place in the inner mitochondrial membrane and involves the transfer of electrons from NADH and FADH2 to a series of protein complexes known as the electron transport chain. This process generates a large amount of ATP through the process of chemiosmosis. Oxidative phosphorylation is also a catabolic process as it involves the breakdown of molecules to produce energy.

Conclusion:
The aerobic respiratory pathway involves both catabolic and anabolic processes. Glycolysis, the citric acid cycle, and oxidative phosphorylation all contribute to the breakdown of organic molecules (catabolism) to produce energy. At the same time, these processes also generate molecules such as ATP and NADH that can be used in anabolic processes, such as the synthesis of macromolecules. Therefore, the term 'amphibolic' is appropriate to describe the aerobic respiratory pathway.

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