Question

What is glycolysis ? Explain its steps.

Answer 1

Glycolysis is the metabolic process that serves as the foundation for both aerobic and anaerobic cellular respiration.

Step 1:Hexokinase
Step 2:Phosphoglucose Isomerase
Step 3: Phosphofructokinase
Step 4: Aldolase
Step 5: Triphosphate isomera
Step 6: Glyceraldehyde-3-phosphate
Step 7: Phosphoglycerate Kinase
Step 8:PhosphoglycerateMutase
Step 9: Enolase
Step 10: Pyruvate Kinase

Answer 2

★ Glycolysis:-

→ It is the partial oxidation (breakdown) of glucose to O2 molecules of pyruvic acid in the absence of O2

→ It occurs in cytoplasm of all living organisms.

→ Its scheme (Greek glycos = sugar, lysis = splitting) was given by Gustav Embden, Otto Meyerhof & J. Parnas. So glycolysis is also known as EMP pathway.

→ In anaerobes, it is the only process in respiration.

→ In plants, glucose is derived from sucrose (end product of photosynthesis) or from storage carbohydrates.

→ Sucrose is converted into glucose & fructose by the enzyme, invertase. These two monosaccharides readily enter the glycolytic pathway.

→ Glucose & fructose are phosphorylated to form glucose-6-phosphate by the enzyme hexokinase. It is then isomerised to produce fructose-6-phosphate. Subsequent steps of metabolism of glucose and fructose are same.

★ Note:- Steps of glycolysis.

→ Look into the attechment for the steps of glycolysis.