Glucose is a simple example.
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They contain carbon, and usually hydrogen. For example, CO2 is not organic, but CH4 is organic.
Carbon is the main component of biologic materials; carbon has the ability to form many bonds and compounds.
Organic molecules contain carbon, such as carbohydrates, proteins, lipids, and nucleic acids. Carbon's ability to form bonds with other atoms, especially hydrogen, oxygen, nitrogen, and phosphorus, allows for the vast diversity of organic molecules found in living organisms.
One example is the process of respiration in animals, where organic compounds containing carbon are broken down to release carbon dioxide, an inorganic compound, as a byproduct. This carbon dioxide is then released into the atmosphere as part of the carbon cycle.
An example of an isotope in my house would be carbon-14, which is used in carbon dating to determine the age of organic materials.