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By Mark A. Ragan

ISBN-10: 0125755503

ISBN-13: 9780125755504

ISBN-10: 0323155618

ISBN-13: 9780323155618

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Gracilis v a r . bacillaris ( H e c k e r et ai, 1974). A n o t h e r p r o p e r t y of t R N A ' s t h a t m a y b e of u s e in p h y l o g e n e t i c s t u d i e s is the interconversion between two chemically distinct but as yet unchar- 4 48 Nucleic Acids a c t e r i z e d f o r m s , as o b s e r v e d for t r y p t o p h a n y l - t R N A ( P r e d d i e et ai, 1973). I n b a c t e r i a , t r y p t o p h a n y l - t R N A is c o n v e r t e d b e t w e e n f o r m s I a n d I I . G r e e n a l g a e c o n t a i n t w o d i s t i n c t i s o a c c e p t i n g t r y p t o p h a n y l - t R N A ' s , o n e of w h i c h a p p e a r s t o be l o c a l i z e d in t h e c h l o r o p l a s t a n d is c a p a b l e of b a c t e r i a l - s t y l e interconversion of form.

T h e e x i s t e n c e of t h e t h r e e c l a s s e s , differing as t h e y d o in g r o s s s t r u c t u r e a n d in f u n c t i o n , is p r o b a b l y t h e r e s u l t of e v o l u t i o n a r y m o d i f i c a t i o n for t h e c o n t r o l of t h e e x p r e s s i o n of g e n e t i c i n f o r m a t i o n . T h e c e l l u l a r R N A is b i o s y n t h e s i z e d by c o n d e n s a t i o n of r i b o n u c l e o t i d e s a l o n g t h e D N A , w h i c h a c t s as a t e m p l a t e .

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. ) 50-56 Storck and Alexopoulos, 1970 30-60 Storck and 1970 Storck and 1970 Storck and 1970 Storck and 1970 Moniliales Cryptococcaceae Candida spp. ) Cryptococcus Rhodotomla spp. )'' spp. )'' Torulopsis spp. 2 DNA: Structure and Composition 35 TABLE 1 (Continued) GC ratio Organism (%) Trichosporon spp.

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A Biochemical Phylogeny of the Protists by Mark A. Ragan


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