When Stimulated by Binding to Bacterial Products, the FMet-Leu-Phe (FMLF) $\alpha$

Multiple Choice

When stimulated by binding to bacterial products, the fMet-Leu-Phe (fMLF) receptor triggers multiple responses by phagocytes, including migration and induction of antimicrobial activities. Most of these responses are activated by small GTPases of the Rac and Rho families that are indirectly activated by fMLF receptor stimulation. The fMLF receptor can initiate multiple downstream signaling pathways because:

A) It couples to a heterotrimeric G protein that has $\alpha$ and $\beta$$\gamma$ subunits with independent activities.
B) It couples directly to two different guanine nucleotide exchange factors (GEFs) .
C) It binds to Rac, Rho, and cdc42 directly.
D) It promotes fusion of phagosomes with lysosomes, initiating multiple signals.
E) It induces assembly of multiple enzymes from individual cytosolic components.