If the basic formula of an a-amino acid is , where
is the side chain, what is the primary point of distinction between any two proteins?
Number of amino groups
Number of carboxyl groups
The side chain R
Relative positions of amino, carboxyl groups and R.
α-amino acids are the constituents of proteins. Different proteins are formed by polymerisation of different α-amino acids, which are formed due to the difference in the side chain substituted group R, which may be as simple as hydrogen or as complex as imidazole.
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