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6 Cards in this Set

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  • Back
How many natural elements are there?
There are 92 naturally occurring elements
What elements are living organisms mostly composed of?
Oxygen
Carbon
Hydrogen
Nitrogen
Compounds
Molecules that are composed of two or more different elements
Inorganic Compounds
small, simple molecules that never contain carbon atoms arranged in chains or rings.

ex: H2O & CO2
organic compounds
large, complex molecules that always contain carbon arranged in rings and chains.
What are the four major classes of organic compounds found in living organisms?
Carbs
Proteins
Lipids
Nucleic Acids