Generally speaking proteins are build up with amino acids and carbohydrates are build from "sugar" rings, which is build up from C, H an O's obeying Cm(H2O)n.
It could be argued that the most basic building block of the body, as in all other things, is the atom. The answer that you are most likely looking for is the protein.
Amino acid is the basic building block of protein.
The basic building block of matter is the atom.
Quartz is the mineral that is the basic building block in many rocks.
basic of spine
Protein is a building block. Eggs can become chickens.
Amino acids are the basic building block to proteins.
An "Atom" is the basic building block of all molecules [first] and [then] biomolecules.
Protein is made from the codes of DNA. The DNA itself is not a building block for anything.
Protein
amino acid
cells