| amino acid | A carbon-based molecule from which protein molecules are assembled.
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| cell | An organized collection of molecules enclosed in a wall-like membrane.
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| habitable zone | The range of distances from a star within which liquid water can exist on the surface of an Earthlike planet.
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| nucleic acid | A long chain of nucleotides. DNA and RNA are nucleic acids.
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| nucleotide | The class of organic molecules of which nucleic acids are composed.
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| protein | A large molecule, consisting of a chain of amino acids, that makes up the bodies of organisms.
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| SETI | The search for extraterrestrial intelligence.
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