Qhov Tseem Ceeb Qhov txawv - Oxygenic vs Anoxygenic Photosynthesis
Photosynthesis yog txheej txheem uas tsim cov carbohydrates (glucose) los ntawm dej thiab carbon dioxide, siv lub zog los ntawm tshav ntuj los ntawm cov nroj tsuag ntsuab, algae, thiab cyanobacteria. Raws li qhov tshwm sim ntawm photosynthesis, gaseous oxygen tso tawm rau ib puag ncig. Nws yog ib txoj hauv kev tseem ceeb heev rau kev muaj sia nyob hauv ntiaj teb. Photosynthesis tuaj yeem muab faib ua ob pawg xws li oxygenic thiab anoxygenic photosynthesis raws li kev tsim cov pa. Qhov sib txawv tseem ceeb ntawm oxygenic thiab anoxygenic photosynthesis yog tias oxygenic photosynthesis generates oxygen molecular thaum lub sij hawm synthesis ntawm qab zib los ntawm carbon dioxide thiab dej thaum anoxygenic photosynthesis tsis tsim oxygen.
Oxygenic Photosynthesis yog dab tsi?
Lub zog ntawm lub hnub ci yog hloov mus rau hauv tshuaj zog los ntawm photosynthesis. Lub teeb yog ntes los ntawm cov xim ntsuab hu ua chlorophylls muaj los ntawm cov kab mob photosynthetic. Siv lub zog absorbed no, chlorophyll cov tshuaj tiv thaiv cov chaw ntawm lub photosystems zoo siab thiab tso tawm electrons uas muaj lub zog siab. Cov hluav taws xob hluav taws xob siab no ntws los ntawm ntau lub tshuab hluav taws xob thiab hloov dej thiab carbon dioxide rau hauv qabzib thiab molecular oxygen. Cov electrons zoo siab taug kev hauv cov saw hlau uas tsis yog-cyclic thiab xaus ntawm NADPH. Vim yog tiam ntawm molecular oxygen, cov txheej txheem no hu ua oxygenic photosynthesis thiab tseem hu ua noncyclic photophosphorylation.
Oxygenic photosynthesis muaj ob lub photosystems hu ua PS I thiab PS II. Ob lub tshuab photosynthetic no muaj ob lub chaw tshuaj tiv thaiv P700 thiab P680. Thaum nqus tau lub teeb, qhov chaw tshuaj tiv thaiv P680 ua rau zoo siab thiab tso tawm cov hluav taws xob siab zog. Cov electrons no taug kev ntawm ob peb lub tshuab hluav taws xob thiab tso qee lub zog thiab raug xa mus rau P700. P700 dhau los ua kev zoo siab vim lub zog no thiab tso tawm lub zog hluav taws xob siab. Cov hluav taws xob no ntws los ntawm ntau tus neeg nqa khoom dua thiab thaum kawg mus txog lub davhlau ya nyob twg electron txais NADP + thiab dhau los ua kom txo hwj chim NADPH. Cov dej molecule hydrolyzes ze PS II thiab pub electrons thiab liberates molecular oxygen. Thaum lub sij hawm xa hluav taws xob thauj khoom, proton motive force yog tsim thiab siv los ua ke ATP los ntawm ADP.
Oxygenic photosynthesis yog qhov tseem ceeb heev vim nws yog cov txheej txheem uas yog lub luag haujlwm rau kev hloov pauv ntawm lub ntiaj teb qub anoxygenic cua rau oxygen nplua nuj huab cua.
Daim duab 01: Oxygenic Photosynthesis
Anoxygenic Photosynthesis yog dab tsi?
Anoxygenic photosynthesis yog cov txheej txheem uas lub teeb lub zog hloov mus rau lub zog tshuaj tsis muaj cov pa oxygen molecular ua cov khoom lag luam. Cov txheej txheem no tau pom hauv ntau pawg kab mob xws li cov kab mob ntshav qab zib, cov kab mob ntsuab sulfur thiab cov kab mob uas tsis yog sulfur, heliobacteria thiab acidobacteria. Yog tsis tsim cov pa oxygen, ATP yog tsim los ntawm cov kab mob no. Dej tsis yog siv los ua tus thawj electron pub rau hauv anoxygenic photosynthesis. Qhov no yog vim li cas oxygen tsis tsim thaum lub sijhawm ua haujlwm no. Tsuas yog ib qho photosystem koom nrog anoxygenic photosynthesis. Li no cov electrons raug thauj mus rau hauv ib lub voj voog voj voog thiab rov qab mus rau tib lub photosystem. Yog li ntawd, anoxygenic photosynthesis tseem hu ua cyclic photophosphorylation.
Anoxygenic photosynthesis nyob ntawm bacteriochlorophylls uas tsis yog chlorophylls siv hauv oxygenic photosynthesis. Ntshav kab mob muaj photosystem kuv nrog P870 cov tshuaj tiv thaiv chaw. Cov khoom siv hluav taws xob sib txawv xws li bacteriopheophytin koom nrog cov txheej txheem no.
Daim duab 02: Anoxygenic Photosynthesis
Qhov txawv ntawm Oxygenic thiab Anoxygenic Photosynthesis yog dab tsi?
Oxygenic vs Anoxygenic Photosynthesis |
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| Oxygenic photosynthesis yog cov txheej txheem uas hloov lub teeb lub zog rau cov tshuaj siv zog los ntawm qee qhov photoautotrophs los ntawm kev tsim cov pa oxygen molecular. | Anoxygenic photosynthesis yog cov txheej txheem uas hloov lub teeb lub zog mus rau lub zog tshuaj los ntawm qee cov kab mob uas tsis tsim cov pa oxygen molecular. |
| Tsim Oxygen | |
| Oxygen tso tawm raws li cov khoom lag luam. | Oxygen tsis tso tawm lossis tsim tawm. |
| Oxygenic photosynthesis yog pom los ntawm cyanobacteria, algae, thiab ntsuab nroj tsuag. | Anoxygenic photosynthesis feem ntau pom los ntawm cov kab mob ntshav liab, cov kab mob ntsuab sulfur thiab cov kab mob uas tsis yog sulfur, heliobacteria, thiab acidobacteria. |
| Electron Transport Chain | |
| Electrons taug kev los ntawm ntau tus neeg nqa khoom siv hluav taws xob. | Nws tshwm sim ntawm cyclic photosynthetic electron saw. |
| Dej raws li tus neeg pub khoom hluav taws xob | |
| Dej yog siv los ua tus thawj electron pub. | Dej tsis yog siv los ua tus pub khoom siv hluav taws xob. |
| Photosystem | |
| Photosystem I thiab II koom nrog oxygenic photosynthesis | Photosystem II tsis muaj nyob rau hauv anoxygenic photosynthesis |
| Tsim NADPH (txo lub zog) | |
| NADPH yog tsim thaum lub sij hawm oxygenic photosynthesis. | NADPH tsis tsim vim tias lub voj voog hluav taws xob rov qab mus rau qhov system. Li no txo hwj chim yog tau los ntawm lwm yam kev tshwm sim. |
Summary – Oxygenic vs Anoxygenic Photosynthesis
Photosynthesis yog txheej txheem uas lub teeb lub zog hloov mus rau hauv tshuaj zog los ntawm cov kab mob photosynthetic. Nws tuaj yeem tshwm sim hauv ob txoj kev: oxygenic photosynthesis thiab anoxygenic photosynthesis. Oxygenic photosynthesis yog cov txheej txheem photosynthetic uas tso tawm cov pa oxygen molecular mus rau qhov chaw thiab pom hauv cov nroj tsuag ntsuab, aglae, thiab cyanobacteria uas muaj chlorophylls. Anoxygenic photosynthesis yog cov txheej txheem photosynthetic uas tsis tsim cov pa oxygen molecular thiab siv los ntawm qee cov kab mob uas muaj bacteriochlorophylls. Yog li, qhov sib txawv ntawm cov pa oxygen thiab anoxygenic photosynthesis feem ntau yog nyob ntawm qhov tsim ntawm oxygen.
