light dependent reaction on photosynthesis

Viewing 8 reply threads
  • Author
    Posts
    • #5798
      biochemical
      Participant

      I’m confused about cyclic and non-cyclic photophosporilation. Do they happen at the same time? And what connects them? Thanks a lot for the help… đŸ˜›

    • #55394
      biochemical
      Participant

      Thank U so much, Keith. It’s really helpful… đŸ™‚

    • #55766
      kabuto
      Participant
      quote keef:

      Non Cyclic Photophosphorylation

      This process is a little more complicated that the cyclic process. There are many important processes occurring at the same time. It will be necessary to run the animation several times and focus in on one step at a time. Only then will it be possible to see them as a single process.

      where is the animation??

    • #55771
      kiekyon
      Participant

      noncyclic phosphorylation produce ATP and NADPH
      cyclic phosphorylation produce ATP but no NADPH

      so, if NADPH level is high, we revert to cyclic phosphorylation

    • #55775
      MrMistery
      Participant

      actually if you really want to be more catholic than the pope, there are 3 kinds of cyclic phosphorilation:
      1. around photosystem I: produces ATP but no NADPH
      2. around photosystem II: does not produce ATP nor NADPH, striclty as a protection mechanism when the electron flow id to great.
      3.(what is reffered to as the water-water cycle): around both photosystems, and also strictly as a protection mechanism.

      Botany is complicated i’m afraid..

    • #55819
      kiekyon
      Participant
      quote MrMistery:

      actually if you really want to be more catholic than the pope, there are 3 kinds of cyclic phosphorilation:
      1. around photosystem I: produces ATP but no NADPH
      2. around photosystem II: does not produce ATP nor NADPH, striclty as a protection mechanism when the electron flow id to great.
      3.(what is reffered to as the water-water cycle): around both photosystems, and also strictly as a protection mechanism.

      Botany is complicated i’m afraid..

      i dont know u can still call something as ‘phosphorylation’ without producing ATP???

    • #55870
      MrMistery
      Participant

      good point. my mistake. three kinds of cyclic electron flow. in generalit’s not good to say cyclic and non-cyclic phosphorilation, because the phosphorilation takes place in the same way, only the ways the electrons are transported are different. That’s why we should always say "cyclic and noncyclic electron transport"

    • #57320

      Question: How to you actually go about making the ATP from ADP during cyclic and noncyclic photophosphorylation? Please respond!

      Many thanks,
      Éireann

    • #116392
      kk
      Participant

      Cyclic photophosphorylation vs. Non-cyclic photophosphorylation

      Which organisms use which mechanism? I’ve been looking for the answer but couldn’t find a reliable one, most answers are very vague. If the organism has both PSI and PSII, it can readily switch between cyclic and non-cyclic, depending on the NADPH concentration? One thing looks certain: isolated chloroplasts use cyclic, but under natural circumstances, what’s the case, please?! Thank you so much in advance!

Viewing 8 reply threads
  • You must be logged in to reply to this topic.