Glycolysis or EMP pathway is common to both aerobic and anaerobic respiration. In glycolysis glucose is converted into 2 molecules of Pyruvic acid. option B is correct

The common phase between aerobic and anaerobic modes of respiration is EMP/glycolysis.


Glycolysis is the metabolic pathway that occurs in the cytoplasm of cells and is the first step in both aerobic and anaerobic respiration. It is a universal pathway found in all living organisms. Glycolysis involves the breakdown of one molecule of glucose into two molecules of pyruvate. This process is anaerobic, meaning it does not require oxygen.


The first phase of glycolysis is called the energy investment phase. In this phase, two ATP molecules are used to phosphorylate glucose, converting it into fructose-1,6-bisphosphate. This step requires the input of energy.


The second phase of glycolysis is the cleavage phase. The fructose-1,6-bisphosphate is split into two molecules of glyceraldehyde-3-phosphate (G3P). Each G3P molecule contains three carbon atoms.


The third phase of glycolysis is the energy generation phase. In this phase, each G3P molecule is converted into pyruvate, producing energy in the form of ATP and NADH. The conversion of G3P to pyruvate involves a series of reactions, which include the production of ATP through substrate-level phosphorylation.


During glycolysis, a net gain of two molecules of ATP is produced through substrate-level phosphorylation. In addition to ATP, NADH is also generated, which can be used in the electron transport chain during aerobic respiration.


At the end of glycolysis, two molecules of pyruvate are produced. In aerobic respiration, these pyruvate molecules enter the mitochondria and undergo further oxidation in the Krebs cycle and oxidative phosphorylation. In anaerobic respiration, the pyruvate molecules are converted into other end products such as lactate or ethanol, depending on the organism.


In summary, the common phase between aerobic and anaerobic modes of respiration is the EMP/glycolysis pathway. This pathway breaks down glucose into pyruvate and generates ATP and NADH. The fate of pyruvate differs in aerobic and anaerobic respiration, but glycolysis is the initial step in both processes.