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Paula_metabolism2 - From the molecules of life to the...

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From the molecules of life, to the simpler organisms Paula B. Matheus Carnevali Part II
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Nutrient requirements O ve r 95 %  o f c e ll dry we ig ht is  m ade  up o f: C arbo n, o xyg e n, hydro g e n, nitro g e n, s ulfur,  pho s pho ro us , po tas s ium , c alc ium , m ag ne s ium ,  and iro n. Ele c tro n m o ve m e nt (e le c tro n trans po rt c hains ,  o xidatio n-re duc tio n re ac tio ns ) pro vide  e ne rg y fo r  us e  in wo rk, and allo w m o le c ule s ’ re duc tio n  during  bio s ynthe s is
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Metabolisms Autotrophs C O 2  sole or  Principal  biosynthetic Carbon source Heterotrophs Reduced, preformed, Organic molecules From other organisms C arbo n s o urc e Ene rg y s o urc e Chemotrophs O xidatio n o f o rg anic O r ino rg anic c o m po unds Organotrophs O rg anic  m o le c ule s Lithotrophs Re duc e d ino rg anic   m o le c ule s Phototrophs Lig ht Ele c tro n s o urc e
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Major nutritional types Major nutritional types of microorganisms From Prescott et al,, 2005
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What is the energy needed for? C he m ic al wo rk invo lve s  the  s ynthe s is  o f  c o m ple x bio lo g ic al m o le c ule s  fro m  m uc h s im ple r  pre c urs o rs , Trans po rt wo rk re q uire s  e ne rg y input in o rde r  to  take  up nutrie nts , e lim inate  was te s , and  m aintain io n balanc e , Me c hanic al wo rk e ne rg y is  re q uire d to   c hang e  phys ic al lo c atio n o f o rg anis m s , c e lls  and  s truc ture s  within the  c e lls .
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Light energy    
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