A Biochemical Phylogeny of the Protists by Mark A. Ragan

By Mark A. Ragan

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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 .

Although approximately the the same DNA's of molecular chloroplasts weight, and Nucleic Acids prokaryotes chloroplastic DNA have has a considerably lower molecular complexity. 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 ) .

45 19-33 Stentor polymorphus Tetrahymena spp. ) Telosporea Plasmodium 43 37 32-35 36 32 34 29-39 herghei 41 SLIME MOLDS Plasmodiophoromycetes 58 Labyrinthula sp. 36 Acrasis rose a 36 Acytostelium leptosomum Dictyostelium spp. ) 22-25 Polysphondylium spp. ) Pro to s t e liu m irreg u la ris Fuligo varians Lycogala sp. ) 34-44 40-44 ALGAE Euglenophyceae 56 Astasia long a 46 Euglena gracilis 48-53 E. gracilis strain Z (1) E. gracilis var. 2 37 DNA: Structure and Composition TABLE 1 (Continued) Organism Griffithsia globulifera Phyllophora nervosa Polyides rotundus Rhodymenia palmata Bacillariophyceae Chaetoceros decipiens Cyclotella cryptica Cylindriotheca fusiformis Melosira italica Navicula spp.

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