Question

Why many biomolecules are very large? Does its size affect its function ?

Answer 1

In this case, many biomolecules are very large because they are mostly formed by the polymerization of many monomers. In this context, biomolecules can accomplish metabolic reactions such as proteins, they can be used as source of energy such as carbohydrates or they can accomplish structural functions such as lipids. Of course, the size matters. For example, enzymes (which are proteins) requires several subunits in order to catalyze several reactions. However, other small proteins can be smaller and act as ligand. On the other hand, carbohydrates can vary their size depending on the function. Glucose is the basic monomer and it is used to produce energy in form of ATP. However, if we want to storage glucose, the carbohydrate will be transformed into glycogen.