All the carbon compounds contained in a living tissue are called biomolecules. But here comes a problem, CO2 is also present inside a tissue which is an inorganic carbon compound and it is not a biomolecule, so this definition would be wrong. Therefore, its correct defamation would be, all the organic carbon compounds inside a living tissue are called biomolecules.
Now let us understand some topics through an experiment, we take a mortar, a pestle and an organic carbon compound for the experiment. Now take organic carbon compound in mortar and add trichloro acetic acid in mortar. After this, mix it well, when it is completely mixed according to you, then filter it with the help of sieve.
When it is filtered, the organic compound that dissolves with acid is called filtered acid soluble pool and some organic compounds that do not dissolve with acid are called acid insoluble pool. The large biomolecule in the acid insoluble pool or which do not dissolve with the acid are called biomacromolecules. Those that are dissolved with acids, such as acid soluble pools, contain very small biomolecule, hence they are called biomicromolecules.