What is the essence of biosynthesis, the process of cleavage?

1) In the course of biosynthesis, more complex substances are always formed from simple substances. This is done by enzymes. For example, in the body of animals, glycogen is synthesized from glucose molecules, and in plants – starch.

2) Cleavage is the reverse process of biosynthesis, which is also carried out under the action of various enzymes. In this case, complex substances are broken down to simple ones. For example, proteins are broken down by pepsin into peptides (shorter amino acid sequences).