Download e-book for iPad: A Biochemical Phylogeny of the Protists by Mark A. Ragan

By Mark A. Ragan

ISBN-10: 0125755503

ISBN-13: 9780125755504

ISBN-10: 0323155618

ISBN-13: 9780323155618

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Valyl-tRNA's from yeast and a r e m o r e s i m i l a r t o e a c h o t h e r t h a n e i t h e r is t o a n y of t h e t h r e e v a l y l - t R N A ' s f r o m E. coli. Y e a s t l e u c y l - t R N A d o e s n o t a p p e a r t o be s t r o n g l y h o m o l o g o u s w i t h t h e l e u c y l - t R N A ' s f r o m E. coli, but the t R N A s p e c i e s for v a l i n e , m e t h i o n i n e , p h e n y l a l a n i n e , t r y p t o p h a n , t y r o s i n e , a l a n i n e , a n d i s o l e u c i n e a r e m o r e s i m i l a r t o e a c h o t h e r t h a n c o u l d be e x p e c t e d by c h a n c e .

5 R N A Molecular Weights S e d i m e n t a t i o n coefficients of R N A m o l e c u l e s in g r a d i e n t s of c e s i u m c h l o r i d e o r s u c r o s e h a v e b e e n used t o i n d i c a t e t h e i r m o l e c u l a r w e i g h t s . I n t u r n , t h e s e m o l e c u l a r w e i g h t s h a v e b e e n e x a m i n e d for i n f o r m a t i o n c o n c e r n ing p h y l o g e n y . T h e b a s i s of t h e p h y l o g e n e t i c s i g n i f i c a n c e of m o l e c u l a r w e i g h t s is, h o w e v e r , u n c l e a r .

Lwoff ( 1 9 5 1 ) h a s s t a t e d t h a t " s u c h i r r e v e r s i b l e e v o l u t i o n h a s t a k e n p l a c e very o f t e n . 3 The Endosymbiotic Theory of Organelle Evolution instances they Polytoma uvella, a n d Astasia longa Chilomonas are capable Polytomella of carotenoid agilis, 27 biosynthesis. Prototheca zopjii, Paramecium cohnii, Paraphysomonas include cijerri, ( D o d g e a n d C r a w f o r d , 1971). T h e c o l o r l e s s c r y p t o m o n a d likewise possesses proplastid-like ( S e p s e n w o l , 1973).

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A Biochemical Phylogeny of the Protists by Mark A. Ragan


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