During glycolysis, NAD (Nicotinamide adenine dinucleotide) removes electrons from 1, 3-diphos-phoglyceric acid using diphospho- glycrealdehyde dehydrogenase. NAD changes to NADR, and this is either utilized as such in anaerobic respiration or in the presence of oxygen.

Explanation:

Glycolysis is the metabolic pathway that converts glucose into pyruvate, producing ATP and NADH in the process. It consists of a series of reactions that occur in the cytoplasm of the cell.

During the process of glycolysis, glucose is broken down into two molecules of glyceraldehyde-3-phosphate (G3P). Each molecule of G3P then undergoes further reactions to produce two molecules of pyruvate.

Oxidation in Glycolysis:
One of the key steps in glycolysis is the oxidation of glyceraldehyde-3-phosphate (G3P). During this step, electrons are transferred from G3P to NAD+ (Nicotinamide adenine dinucleotide), a coenzyme that functions as an electron carrier in cellular respiration.

Role of NAD in Glycolysis:
NAD+ is a coenzyme that accepts two high-energy electrons and a hydrogen ion (H+) to form NADH. This conversion of NAD+ to NADH is known as reduction, as it involves the gain of electrons.

In glycolysis, NAD+ is reduced to NADH during the oxidation of G3P. This oxidation reaction involves the removal of two electrons from G3P and their transfer to NAD+, resulting in the formation of NADH. The electrons carried by NADH can be used to generate ATP in later stages of cellular respiration.

Importance of NADH:
NADH plays a crucial role in the production of ATP, the main energy currency of the cell. It acts as an electron carrier, shuttling electrons from glycolysis and other metabolic pathways to the electron transport chain, where they are used to generate ATP through oxidative phosphorylation.

In summary, during glycolysis, electrons are removed by NAD+ and transferred to NADH during the oxidation of glyceraldehyde-3-phosphate. NADH then carries these electrons to the electron transport chain, where ATP is generated through oxidative phosphorylation.

Glycolysis is metabolic pathway that converts glucose C6H12O6, into pyruvate, CH3COCOO + H+. In glycolysis, during oxidation electrons are removed by NAD+ which den converted into NADH2. Oxidation of glyceraldehyde 3-phosphate into 1,3-bis phospho glycerate leads to production of 2 NADH2 molecules. Thus, option C is correct. ATP, glyceraldehyde 3-phosphate and molecular oxygen are not involved in removal of electrons during glycolysis. Thus, other options are incorrect