CBSE Class 9 Answered

Biochemical Pathway is a series of enzyme catalysed reactions.

All the metabolic activities which occur within an organism’s body are all biochemical pathways because they all consist of enzyme catalysed reactions. Example: Digestion, Respiration, Photosynthesis.

In a biochemical pathway, The first enzyme converts the first substrate (reactant) into a product. The products formed then acts as a substrate for the second reaction of that pathway which will be converted to a new product by another enzyme and so on.

For example: In glycolysis, First the glucose is converted into glucose-6-phosphate by the enzyme hexokinase. For the second reaction of glycolysis, glucose-6-phosphate acts as a substrate and is converted into Fructose-6-phosphate by another enzyme isomerase. Then for the next reaction, fructose-6-phosphate acts as a substrate and so on until the final product is receive in the pathway.