Question

What are the main steps in aerobic respiration? Where does it take place?

Answer 1

Explanation:

Aerobic respiration is defined as the oxidation of respiratory substrate to produce energy in presence of oxygen. The major steps of aerobic respiration are :

Glycolysis: This process takes place in the cytosol and produces two moles of pyruvate. This process is common for both aerobic and anaerobic respiration.

oxidation of pyruvate: This step is a bridge between glycolysis and kreb's cycle. In this step pyruvate oxidizes into acetyl-CoA.

Kreb's cycle: This step occurs in the mitochondrial matrix and results in the production of two molecules of Carbon dioxide.

Oxidative phosphorylation: This is the final step of aerobic respiration and takes place in the mitochondrial membrane. Most of the free energy is released in this step. In this step NADH/ FADH₂ transfers electron to O₂ at the end of a electron transport chain.  Electron transport through a series of enzyme complexes  results in establishment of a proton gradient across the membrane and drives the formation of ATP.

Answer 2

The main steps in aerobic respiration:

The aerobic respiration is the process of breakdown of the respiratory substrate in presence of oxygen. This aerobic respiration leads to the complete breakdown of the substrate to form carbon dioxide, water vapour, and ammonia.

This aerobic respiration has three main steps-

• Glycolysis –Glycolysis is the process where, the glucose is broken down into simpler pyruvate phosphates and NADH molecules.

• Krebs Cycle – Krebs cycle is the cyclic process that is formed from tricarboxylic acid called citric acid. This leads to formation of different intermediate products and evolution of carbon dioxide in 3 steps.

• ETC – ETC or the Electron Transport Chain is the process of end step reduction which regenerates to form water vapour at the end step and subsequent formation of ATP.