Site MapHelpFeedback

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

AstronomyOnline Learning Center

Home > Chapter 27 > Glossary