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Chapter 21 705
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polypeptide
many amino acids linked by amide bonds.
primary structure
the sequence of amino acids and the location of the disulfide bridges in a
polypeptide or protein.
protein
a naturally occurring polymer of 40 to 4000 amino acids linked by amide bonds.
quaternary structure
a description of the way in which the individual polypeptide chains in a protein
with more than one chain are arranged with respect to one other.
secondary structure
a description of the conformation of the backbone of a polypeptide or protein.
side chain
the substituent attached to the
a
-carbon of an amino acid.
structural protein
a protein that gives strength to a biological structure.
subunit
a polypeptide chain of protein that has more than one polypeptide chain.
tertiary structure
a description of the three-dimensional arrangement of all the atoms in a protein.
thin-layer chromatography
a technique that separates compounds on the basis of their polarity.
tripeptide
three amino acids linked by amide bonds.
zwitterion
a compound with a negative charge and a positive charge on nonadjacent atoms.