[1]An organism is a complete living plant or animal.
[2]Metabolism is the sum of the life-sustaining activities in a living
organism, including nutrition, production of energy, and synthesis
(building) of new living material.
[3]Morphologists are biologists specializing in the structure of
organisms or in the study of whole organisms. Biochemists, by
contrast, study chemical reactions of biological materials.
[4]This is not to be confused with a cell nucleus. This word was
borrowed from biology for atomic theory, however.
[5]An exception is the hydrogen atom, which has no neutron in its
nucleus.
[6]Mev is the abbreviation for million electron volts.
[7]A concept for which James D. Watson of the United States and Francis
H. C. Crick of England shared a Nobel Prize in 1962.
[8]The study of tissues.
[9]There are additional, more subtle metabolic events that lead to the
synthesis of DNA, but they are not important in this discussion.