Non-essential small GTPase of the Rho/Rac family of Ras-like proteins; likely involved in protein kinase C (Pkc1p)-dependent signal transduction pathway that controls cell integrity; role in carbohydrate metabolism, acting upstream of the Ras2p GTPase in cAMP-mediated protein kinase A signaling; regulated by phosphorylation and ubiquitination; necessary for oxidant and ramped heat stress-induced cell death; ortholog of mammalian RAC1