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Difficulties in the fixation and embedding of yeast cells suitable for electron microscopy studies have been reported by many workers since the early observations on the presence of mitochondria in these cells (Agar and Douglas, 1957 ; Hagedorn, 1957; Hirano and Lindgren, 1961 ; Vitols et al ., 1961 ; Yotsuyanagi, 1962) . In particular, the reported absence of mitochondrial profiles in yeast cells grown anaerobically without lipid supplements (Polakis et al., 1964; Linnane, 1965 ; Wallace et al., 1968) has recently been shown to be due to inadequate fixation by potassium permanganate (Damsky et al ., 1969 ; Plattner and Schatz, 1969; Watson et al ., 1970, 1971) . The mitochondrial structures in the anaerobic lipid-depleted cell were observed by freeze etching (Plattner and Schatz, 1969) to be similar in morphology to those present in the aerobic and anaerobic lipid-supplemented cells . On the other hand, we have recently reported (Watson et al ., 1970, 1971) that the mitochondrial precursors in the lipid-depleted cell are quite distinct, both morphologically and biochemically, to mitochondria) structures in the aerobic and anaerobic lipid-supplemented cells. Damsky et al . (1969) have also reported the presence of primitive mitochondrial structures, similar to those isolated by Watson et al . (1970, 1971), in partially disrupted anaerobic lipid-depleted cells . A further difference was the nondetectability of mitochondrial ribosomal RNA species (Forrester et al., 1971) and an active mitochondrial protein synthesizing system (Watson et al ., 1971) in the lipid-depleted anaerobic cell, both of which are present in the case of the lipid-supplemented anaerobic cell (Watson et al ., 1971 ; Forrester et al., 1971) . The experiments on the lipid-depleted

THE ORGANIZATION OF RIBOSOMAL GRANULES WITHIN MITOCHONDRIAL STRUCTURES OF AEROBIC AND ANAEROBIC CELLS OF SACCHAROMYCES CEREVISAE