A Biochemical Phylogeny of the Protists - download pdf or read online

By Mark A. Ragan

ISBN-10: 0125755503

ISBN-13: 9780125755504

ISBN-10: 0323155618

ISBN-13: 9780323155618

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Example text

Gracilis (Krauspe a n d P a r t h i e r , 1 9 7 3 , 1974; P a r t h i e r a n d K r a u s p e , 1974). F u r t h e r m o r e , B e a u c h e m i n et ai ( 1 9 7 3 ) h a v e d e s c r i b e d t h e v i r t u a l i d e n t i t y of c o m p o n e n t s f r o m A. nidulans a n d E. coli. There are indications that some chloroplastic a m i n o a c y l - t R N A synthet a s e s m a y be e n c o d e d in t h e c h l o r o p l a s t g e n o m e of Euglena gracilis s t r a i n Β ( R e g e r et ai, 1970) a n d E.

F o r t h i s r e a s o n it is likely t h a t m o l e c u l a r d e t a i l s of D N A s t r u c t u r e will b e of f u n d a m e n t a l i m p o r t a n c e in b i o c h e m i c a l p h y l o g e n i e s . T h e o r e t i c a l l y it m a y b e p o s s i b l e t o d i s c o v e r d i s t a n t r e l a t i o n s h i p s a m o n g all p r o t i s t s a n d h i g h e r f o r m s b y t h e p r o p e r e x a m i n a t i o n of i n f o r m a t i o n - b e a r i n g DNA. T h e d e o x y r i b o n u c l e o t i d e p r i m a r y s e q u e n c e of D N A w o u l d be e x p e c t e d t o p r o v i d e t h e m o s t i n t e r e s t i n g i n f o r m a t i o n o n e v o l u t i o n ; u n f o r t u n a t e l y , it is e x c e e d i n g l y difficult t o s e q u e n c e D N A .

3 RNA: S T R U C T U R E S A N D COMPOSITION R i b o n u c l e i c a c i d is f o u n d in all o r g a n i s m s e x c e p t t h e D N A v i r u s e s . It a p p e a r s t o exist in t h r e e different f o r m s in t h e p r o t i s t s : m e s s e n g e r R N A ( m R N A ) , transfer or soluble R N A ( t R N A ) , and ribosomal R N A ( r R N A ) . 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 .

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A Biochemical Phylogeny of the Protists by Mark A. Ragan


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