This document provides an overview of organic and inorganic compounds, categories of organic compounds including carbohydrates, proteins, lipids, and nucleic acids. It describes the basic structures and functions of these biomolecules, such as carbohydrates being the primary energy source and made up of sugars/starches with a carbon, hydrogen, oxygen ratio of 1:2:1. Proteins are made of amino acids that form peptide bonds, and enzymes are protein catalysts. Lipids include fats/oils and have energy storage and membrane roles. Nucleic acids DNA and RNA are made of nucleotides containing sugars, phosphates, and nitrogen bases that form base pairs.