The Mechanism for All Template-Directed Synthesis of Any Type of Nucleic

Multiple Choice

The mechanism for all template-directed synthesis of any type of nucleic acid involves the following:

A) Nucleophilic attack of a 3' hydroxyl toward a nucleoside triphosphate, releasing PP_i.
B) Nucleophilic attack of a 5' hydroxyl toward a nucleoside triphosphate, releasing PP_i.
C) Nucleophilic attack of a 3' hydroxyl toward a nucleoside triphosphate, releasing P_i.
D) Nucleophilic attack of a 5' hydroxyl toward a nucleoside triphosphate, releasing P_i.
E) More than one of these would work, since the mechanism is not universal.