The systems of electron transport to oxygen and other acceptors were analyzed during endogenous respiration of Torulopsis candida resting cells taken at the logarithmic phase of growth of the culture in a medium containing glucose and hexadecane. The following electron transport chains were shown to function in the cells growing both on glucose and hexadecane: (1) the main (phosphorylating) respiration chain inhibited by cyanide and antimycin A and comprising flavoproteins and cytochromes b, c and a+a3; (2) the cyanide resistant electron transport chain inhibited by hydroxamic acids (it seems to function more intensively in the cells grown on glucose); (3) the chain of electron transport to H2O2 which is blocked with antimycin A and includes flavoproteins, cytochromes b and c, and apparently cytochrome c peroxidase; (4) the chain(s) containing cytochrome P-450 and found in the microsomal fraction of yeast cells grown on hexadecane.