Final Answer:
Arp2 and Arp3 are actin homologs. Options A and B are the answer.
Step-by-step explanation:
Actin-related proteins (Arps) are homologs of actin, and they play crucial roles in cellular processes such as cytoskeleton dynamics and intracellular transport. In the provided options, Arp2 (option A) and Arp3 (option B) are actin homologs.
Arp2 and Arp3 are essential components of the ARP2/3 complex, which is involved in the nucleation of actin filaments. This complex promotes the formation of branched actin networks, contributing to processes like cell motility and shape changes. Options C (MreB) and D (ParM) are bacterial proteins with roles in bacterial cell shape and plasmid segregation, respectively, but they are not actin homologs.
Options A and B are the answer.