Why learn about biological moleculesWatch
At the further levels, you need it to get an idea and understanding of the structures, how the molecules and complexes work and react with each other and why. And how they had an influence on our health and surrounding. After school and university Chemists in the food and pharmaceutical industry and refinery for instances need this background about the molecules to synthesize another substances from those and to know how to work with them. In short: it is an important basic. The sooner, the better for understanding.