Enzymatic Ribonucleotide Reduction Is Accomplished Via a Free Radical Mechanism

Multiple Choice

Enzymatic ribonucleotide reduction is accomplished via a free radical mechanism.Which of the following statements regarding this process is correct?

A) The substrate specificity site on the R1 homodimer determines if the enzyme is active or inactive.
B) R2 has a single active site containing 2 Fe atoms that generate the free radicals.
C) R2,but not R1,functions in the delivery of reducing equivalents.
D) R2 homodimer carries 2 regulatory sites.