Macromolecules are molecules containing long chains of atoms such as proteins, sugars, nucleic acid, etc. In these long chains molecules, the backbone that joins them together is called the carbon backbone.
The carbon backbone serves as the skeleton and the framework of the macromolecules and they are covalently bonded to one another.
Biological macromolecules consist of chiral monomer units with a spatial arrangement known as conformation and/or arrangement in non-rotating bonds around the chiral centers (configuration).
Therefore, we can conclude that the molecules join to form long chains with a carbon backbone.
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