* Carbohydrates: Contain carbon, hydrogen, and oxygen in a ratio of approximately 1:2:1. Examples include sugars, starches, and cellulose.

* Lipids (fats and oils): Contain carbon, hydrogen, and oxygen, but in a lower proportion of oxygen than carbohydrates. Examples include triglycerides, phospholipids, and steroids.

* Proteins: Contain carbon, hydrogen, oxygen, nitrogen, and often sulfur. Oxygen is present in the amino acid side chains and the peptide bonds that link amino acids together.

* Nucleic acids (DNA and RNA): Contain carbon, hydrogen, oxygen, nitrogen, and phosphorus. Oxygen is present in the sugar-phosphate backbone and the nitrogenous bases.

So, while oxygen is a common component of all biomolecules, the specific amount and arrangement of oxygen varies depending on the type of molecule.