Question

All foods we eat are made of the same basic component. What major molecule is said to be the
backbone of all other larger molecules used in living cells?

Answer 1

hydrocarbons
As the backbone of the large molecules of living things, hydrocarbons may exist as linear carbon chains, carbon rings, or combinations of both. Furthermore, individual carbon-to-carbon bonds may be single, double, or triple covalent bonds; each type of bond affects the geometry of the molecule in a specific way.

https://courses.lumenlearning.com/boundless-biology/chapter/carbon/