GTP-binding protein involved in protein trafficking; may modulate vesicle budding and uncoating within the Golgi apparatus (By similarity). Promotes cell movement and remodeling of the actin cytoskeleton during compound eye morphogenesis (PubMed:21976699). Required for normal ethanol-induced tolerance and preference (PubMed:28607459). Probably after Efa6-mediated activation, counteracts ethanol-induced sedation (PubMed:28607459). Activation is generally mediated by a guanine exchange factor (GEF), while inactivation through hydrolysis of bound GTP is catalyzed by a GTPase activating protein (GAP) (By similarity). May be activated by Efa6 (PubMed:28607459). Expressed in the head (at protein level). Results in enhances preference and sensitivity to alcohol (PubMed:28607459). Fails to develop tolerance to repeated ethanol exposures (PubMed:28607459). Conditional RNAi-mediated knockdown in the eye results in aberrant compound eye morphogenesis, with defective cell intercalation patterns associated with altered actin dynamics (PubMed:21976699). Belongs to the small GTPase superfamily. Arf family.