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Transcript 
Proteins
Amino acids are the basic structural units of proteins. An
amino acid is a compound that contains at least one amino
group (-NH2) and at least one carboxyl group (-COOH)
H O
H O
+H N
3
C C O- + +H3N C C OR2
R1
Peptide bond
H O
H O
+H N
3
C C N C C O- + H2O
R1
H R2
25.3
25.3
Protein Structure
Carbon
Nitrogen
Oxygen
R group
The structure is
held in position by
intramolecular
hydrogen bonds
(………)
Hydrogen
25.3
Protein Structure
25.3
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