On the backbone of a polypeptide chain what is the functional group called with the double bonded oxygen?

Is it a keytone? I think it might not be because the backbone isn't all carbon ( -C-C-N-C-C-N -...) so there is a nitrogen bonded to one of the carbons.

Answer:
The C=O is called a carbonyl. The whole group RCONHR is called an amide.
the oxygen double bonds are that of the carboxylic acid (-COOH) of 1 amino acid. they form bonds with the amino (NH2) group of the preceeding amino acid. the bonds are called peptide bonds.
it is not a ketone (no y) because it is not flanked by two carbons.

it is simply a carbonyl, which is the C=O
if it is on the end of the polypeptide, it is the carboxyl terminal, because it will be the acid form: C-(C=O)-OH

hope that helps
http://en.wikipedia.org/wiki/carboxyl_gr...

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