Tag: zoology

Oxygen from air is the chief requirement for aerobic respiration to take place in the cells. However, in absence of air or oxygen, many organisms are capable to respire using anaerobic respiration. Life without air is considered anaerobic.

Anaerobic respiration takes place in the the cytoplasm of the cell, at a distance from mitochondria. After the glycolysis, pyruvate is further oxidised anaerobically producing energy which is much less than that produced aerobically.

Glycolysis takes place in the anaerobic condition in the cytosol of cytoplasm in all cells, Krebs cycle takes place in the aerobic condition in the mitochondrial matrix of eukaryotic cells.

Acetyl CoA is synthesized during oxidative decarboxylation of pyruvic acid and the reaction takes place in the mitochondrial matrix in which two molecules of NADH are produced and it enters the citric acid cycle.

The pentose phosphate pathway (PPP) or HMP shunt is a biochemical pathway parallel to glycolysis that generates NADPH (reduced energy) and pentoses. PPP was described by Warburg and Dickens. 

An anaerobic respiration a type of respiration in which an organism generates usable energy without the involvement of oxygen. So, in brief, it is respiration without oxygen. It was first reported by Kostychev.

A.Oxidation – Release of electrons and protons or reaction with oxygen

B.Reduction – Acceptance of electrons and protons or release of oxygen.

C. Hydrolysis – Breaking of molecules in presence of water.

D.Synthesis – Process of formation of biomolecules.

So, the correct option is ‘oxidation’.