Qhov Tseem Ceeb Qhov txawv - Cyclic vs Noncyclic Photophosphorylation
Photophosphorylation lossis photosynthetic phosphorylation yog txheej txheem uas ATP raug tsim thaum lub teeb-nyob ntawm kev cuam tshuam ntawm photosynthesis. Ib pawg phosphate tau ntxiv rau ADP los tsim ATP, siv cov proton motive quab yuam tsim thaum lub sij hawm cyclic thiab noncyclic electron thauj chains ntawm photosynthesis. Lub zog yog muab los ntawm lub hnub ci los pib cov txheej txheem thiab ATP synthesis tshwm sim ntawm ATPase complexes nyob rau hauv thylakoid daim nyias nyias ntawm chloroplasts. ATP synthesis thaum lub sij hawm cyclic electron ntws ntawm anoxygenic photosynthesis yog hu ua cyclic photophosphorylation. ATP ntau lawm thaum lub sij hawm noncyclic electron ntws ntawm oxygenic photosynthesis yog hu ua noncyclic photophosphorylation. Qhov no yog qhov sib txawv tseem ceeb ntawm cyclic thiab noncyclic photophosphorylation.
YCyclic Photophosphorylation yog dab tsi?
Cyclic phosphorylation yog txheej txheem uas tsim ATP los ntawm ADP thaum lub teeb nyob ntawm lub teeb ciclic electron thauj saw ntawm photosynthesis. Photosystem kuv koom nrog hauv cov txheej txheem no. Thaum chlorophylls ntawm PS Kuv nqus lub teeb lub zog, lub zog hluav taws xob siab tau tso tawm los ntawm P700 qhov chaw tshuaj tiv thaiv. Cov electrons no tau txais los ntawm tus thawj electron txais thiab tom qab ntawd mus los ntawm ntau lub tshuab txais hluav taws xob xws li ferredoxin (Fd), plastoquinone (PQ), cytochrome complex thiab plastocyanin (PC). Thaum kawg, cov hluav taws xob no rov qab mus rau P700 tom qab dhau los ntawm kev txav mus los. Thaum cov electrons taug kev downhill los ntawm cov khoom siv hluav taws xob, lawv tso lub zog muaj peev xwm. Lub zog no yog siv los tsim ATP los ntawm ADP los ntawm ATP synthase enzyme. Li no, cov txheej txheem no hu ua cyclic photophosphorylation.
PS II tsis koom nrog hauv cyclic photophosphorylation. Yog li ntawd, dej tsis koom nrog hauv cov txheej txheem no; Yog li ntawd, cyclic photophosphorylation tsis tsim cov pa oxygen molecular raws li cov khoom lag luam. Txij li thaum cov hluav taws xob rov qab mus rau PS I, tsis muaj hluav taws xob txo qis (tsis muaj NADPH) thaum lub sij hawm cyclic photophosphorylation.
Daim duab 01: Cyclic photophosphorylation
Noncyclic Photophosphorylation yog dab tsi?
Noncyclic photophosphorylation yog txheej txheem ntawm ATP synthesis siv lub teeb lub zog los ntawm noncyclic electron thauj saw ntawm photosynthesis. Ob hom photosystems koom nrog hauv cov txheej txheem no hu ua PS I thiab PS II. Noncyclic photophosphorylation yog pib los ntawm PS II. Nws absorbs lub teeb lub zog thiab tso tawm lub zog hluav taws xob siab. Cov dej molecules sib cais ze PS II los ntawm kev tso cov protons (H + ions) thiab molecular oxygen vim lub zog nqus. Lub zog hluav taws xob siab tau txais los ntawm tus thawj electron txais thiab dhau los ntawm plastoquinone (PQ), cytochrome complex, thiab plastocyanin (PC). Tom qab ntawd cov electrons raug coj los ntawm PS I. Cov hluav taws xob uas tau txais los ntawm PS Kuv tau dhau los ntawm cov neeg txais hluav taws xob thiab mus txog NADP+ Cov electrons no ua ke nrog H+thiab NADP+ los ua NADPH thiab txiav tawm cov saw hlau thauj hluav taws xob. Thaum lub sij hawm xa hluav taws xob thauj khoom, lub zog tso tawm yog siv los tsim ATP los ntawm ADP. Txij li thaum cov electrons tsis rov qab mus rau PS II, cov txheej txheem no hu ua noncyclic photophosphorylation.
Y Piv rau cyclic photophosphorylation, noncyclic photophosphorylation yog ib txwm muaj thiab pom dav hauv txhua cov nroj tsuag ntsuab, algae, thiab cyanobacteria. Nws yog cov txheej txheem kis kab mob rau cov kab mob uas muaj sia nyob vim qhov no tsuas yog cov txheej txheem uas tso tawm cov pa oxygen molecular rau ib puag ncig.
Daim duab 02: Noncyclic photophosphorylation
Qhov txawv ntawm Cyclic thiab Noncyclic Photophosphorylation yog dab tsi?
Cyclic vs Noncyclic Photophosphorylation |
|
| Cyclic photophosphorylation yog hais txog cov txheej txheem uas tsim ATP thaum lub sij hawm cyclic electron thauj saw ntawm lub teeb nyob ntawm photosynthesis. | Noncyclic photophosphorylation yog hais txog cov txheej txheem uas tsim ATP los ntawm noncyclic electron thauj saw hauv lub teeb pom kev ntawm photosynthesis. |
| Photosystem | |
| Tsuas yog ib qho kev yees duab (PS I) koom nrog hauv cyclic photophosphorylation. | Photosystem kuv thiab II koom nrog hauv noncyclic photophosphorylation. |
| Xwm ntawm Electron Transport Chain | |
| Electrons taug kev hauv lub voj voog hluav taws xob thauj khoom thiab rov qab mus rau PS I | Electrons taug kev hauv cov saw hlau uas tsis yog-cyclic. |
| khoom | |
| Tsuas ATP yog tsim nyob rau hauv cov txheej txheem no. | ATP, O2, thiab NADPH raug tsim tawm hauv cov txheej txheem no. |
| Dej tsis sib cais thaum lub sijhawm txheej txheem no. | Dej faib los yog photolyses. |
| Tsim Oxygen | |
| Oxygen tsis tsim thaum lub sij hawm cyclic photophosphorylation | Molecular oxygen yog tsim nyob rau hauv noncyclic photophosphorylation. |
| First Electron Donor | |
| thawj tus neeg pub khoom siv hluav taws xob yog PS I. | Dej yog thawj tus neeg pub khoom siv hluav taws xob. |
| Thawj Electron Acceptor | |
| Qhov kawg electron txais yog PS I. | Qhov kawg electron txais yog NADP + |
| Cov kab mob | |
| Cyclic photophosphorylation yog pom los ntawm qee cov kab mob. | Noncyclic photophosphorylation yog muaj nyob rau hauv cov nroj tsuag ntsuab, algae, thiab cyanobacteria. |
Summary – Cyclic vs Noncyclic Photophosphorylation
ATP yog tsim los ntawm lub teeb lub zog nqus thaum lub sijhawm photosynthesis. Cov txheej txheem no hu ua photophosphorylation. Photophosphorylation tuaj yeem tshwm sim ntawm ob txoj hauv kev hu ua cyclic thiab noncyclic photophosphorylation. Thaum lub sij hawm cyclic photophosphorylation, lub zog siab hluav taws xob taug kev los ntawm cov neeg txais hluav taws xob hauv kev txav mus los thiab tso lub zog los tsim ATP. Thaum lub sij hawm noncyclic photophosphorylation, siab zog electrons ntws los ntawm electron txais nyob rau hauv Z-shaped noncyclic txav. Tso tawm electrons tsis rov qab mus rau tib lub photosystems hauv noncyclic photophosphorylation. Txawm li cas los xij, nyob rau hauv ob qho tib si txheej txheem, ATP yog tsim nyob rau hauv tib yam uas siv lub peev xwm lub zog tso tawm los ntawm electron thauj saw. Noncyclic photophosphorylation tsim ATP, O2, thiab NADPH thaum cyclic photophosphorylation tsuas yog tsim ATP. Ob lub photosystems koom nrog hauv noncyclic photophosphorylation thaum tsuas yog ib qho photosystem (PS I) koom nrog hauv cyclic photophosphorylation. Qhov no yog qhov sib txawv ntawm cyclic thiab noncyclic photophosphorylation.
