Biomolecules contain protoplasm which other molecules do not contain. Micromolecules are with low molecular weight e.g glucose, water. Macromolecules are with high molecular weight e.g starch, protein etc.
In terms of the human body, bioelements are any compounds or molecules that make up the body and help it with various functions, such as breathing. Some of these bioelements include: oxygen, nitrogen, and calcium.