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What is a molecule? -- in my notes, I have written down that the bonding
of the subunits in hemoglobin is a molecule even though there are no covalent
bonds -- so what exactly constitutes a protein molecule?&nbsp; </font>A molecule
in biochemistry is what stays together in the cell and can be isolated such
that all the subunits stay together when subjected to mild separation techniques.
  That is, if the atoms all stay together in the same superimposable way
from one structure to another, then that structure is a molecule even though
it is held together by non-covalent, weak bonds.  
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