Ketones are organic compounds that are typically characterized by the presence of a carbonyl group, though they can be a variety of carbon containing substituents. Numerous ketones are created and widely used for their importance in both contemporary industry and biology. These include several sugars, which are known as ketoses, and industrial solvents. Ketones are created on large scales to be used in industrial locations as a solvent and a polymer precursor. The ketones that are most commonly used range from acetones, methylethyl ketones, and cyclohexanones. Each of these are used in biochemistry, though less in general organic chemistry applications. Although it can be difficult for scientists to pinpoint the exact toxicity of such a broad range of compounds, basic ketones are often not highly toxic. It is this characteristic that lends to their popular use in many different applications as a solvent and polymerization agent for more complicated substances.