What macromolecule has the function of providing structure and catalyzing reactions (as enzymes)?

Proteins are macromolecules that are mainly responsible for giving structure and catalyzing reactions in the form of enzymes. Macromolecules are very large proteins that perform these functions within the cells of several organisms. In exercise, this is actually used up last after all the carbohydrates and fats have been metabolized. In starvation mode, this is also the last resort of the body in order for it to survive.

When a virus infects a host cell, it uses the cell's machinery to make copies of its own genetic material in a process called replication. finally, during the process of self-assembly, that protein shell and the copies of the virus's genetic material are assembled into new viruses.