Final Answer:
The γ-tubulin ring complex is to microtubules what the Arp 2/3 complex is to actin filaments. Option A is the answer.
Step-by-step explanation:
The γ-tubulin ring complex (γ-TuRC) and the Arp 2/3 complex play analogous roles in nucleating the assembly of their respective cytoskeletal structures. The γ-TuRC is responsible for microtubule nucleation, providing a template for the rapid growth of microtubules from the centrosome during cell division. Similarly, the Arp 2/3 complex is involved in nucleating the assembly of actin filaments, particularly in the formation of branched actin networks.
Both complexes serve as critical nucleating factors, initiating the polymerization of their respective cytoskeletal elements and influencing the architecture of the cellular cytoskeleton.
Option A is the answer.