A Biochemical Phylogeny of the Protists by Mark A. Ragan

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Cryptococcus Rhodotomla spp. )'' spp. )'' Torulopsis spp. 2 DNA: Structure and Composition 35 TABLE 1 (Continued) GC ratio Organism (%) Trichosporon spp. ) Moniliaceae Aspergiflus spp. ) Paecilomyces spp. ) Penicillium spp. ) Crithidia spp. ) Leishmania spp. ) Schizotrypanum cruzi Trichomonas spp. ) Trypanosoma spp. , 1971 Storck and Alexopoulos, 1970 Storck and Alexopoulos, 1970 Storck and Alexopoulos, 1970 Mandel, 1967; Tuan and Chang, 1975 Mandel, 1967 Mandel, 1967 Shapiro, 1968 Mandel, 1967 Mandel, 1968 Mandel, 1967; Marzzoco and Colli, 1974 Mandel, 1967 Mandel, 1967 Mandel, 1967 36 4 Nucleic Acids TABLE 1 (Continued) GC ratio (%) Organism Ciliatea Actinosphaerium nucleofilum Blepharisma americanum Colpidium spp.

Rhizopus spp. ) 47-52 Thamnidiaceae Chaetocladium brefeldii 41 Cokeromyces spp. ) 50-54 Radiomyces spp. ) 44-50 Thamnidium spp. ) 34-54 Saccharomycetaceae Debaryomyces spp. ) 34-45 Hansenula spp. ) 29-45 Pichia spp. ) 26-46 Saccharomyces 30-48 spp. ) Reference Storck and Alexopoulos, 1970 Storck and Alexopoulos, 1970 Storck and Alexopoulos, 1970 Storck and Alexopoulos, 1970; Nakase and Komagata, 1971a,b; Yarrow and Nakase, 1975 4 34 TABLE 1 Nucleic Acids {Continued) GC ratio (%) Organism Schizosaccharomyccs spp.

3 χ 1 0 d a l t o n s , w h e r e a s a m o n g t h e h i g h e r a n i m a l s t h e t r e n d t o w a r d i n c r e a s i n g m o r p h o l o g i c a l c o m p l e x i t y is p a r a l l e l e d w i t h a n i n c r e a s e in t h e m o l e c u l a r w e i g h t of t h e 28 S s u b u n i t . Euglena gracilis is a n e x c e p t i o n a m o n g p h o t o s y n t h e t i c o r g a n i s m s by 6 p o s s e s s i n g a h e a v i e r ( 1 . 3 - 1 . 5 χ 1 0 d a l t o n s ) s u b u n i t . 55 χ 1 0 d a l t o n s ) a n d Entamoeba s p .