This figure showing E. coli DNA polymerase ? subunit suggests:
A. the majority of the ? sheets are between the polypeptides.
B. the polymerase contains only antiparallel ? sheets.
C. the ? helices contain several acidic R groups.
D. the ? helices contain several basic R groups.
E. substitution of amino acids within the polypeptides would not alter enzyme function.
D
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