1. Dismiss Notice
  2. Guest, be sure to check out How To Get Into Dental School, our free downloadable PDF with step-by-step details for dental school applicants!
    Dismiss Notice
  3. Dismiss Notice
  4. Download free Tapatalk for iPhone or Tapatalk for Android for your phone and follow the SDN forums with push notifications.
    Dismiss Notice
  5. Hey Texans—join us for a DFW meetup! Click here to learn more.
    Dismiss Notice

calvin cycle (dark rxn)

Discussion in 'DAT Discussions' started by joonkimdds, Jan 7, 2009.

  1. joonkimdds

    joonkimdds Senior Member
    7+ Year Member

    Joined:
    Jun 30, 2005
    Messages:
    2,780
    Likes Received:
    2
    Status:
    Pre-Dental
    DAT destroyer says 6 cycle is required to make 1 glucose.
    I am wondering why it takes 6 cycle instead of 2 cycle.

    1 cycle = 3 CO2, 9ATP, 6NADPH added to Rubisco and 3RuBP.

    It becomes 6 of 3PGA ==> 6 of G3P and only 1 of them is used to make glucose.

    Since G3P is 3carbon, and glucose is 6 carbon, we need to repeat this cycle one more time to make 2 of G3P = 2 of 3 carbon = 6 carbon = glucose.

    so I think only 2 cycles are required to make 1 glucose instead of 6 cycle.



    Another question I have is, what do the concentration of H and Mg2+ stored in chlorophyll have something to do about this cycle?
     
  2. Note: SDN Members do not see this ad.

  3. Svart Aske

    Svart Aske is stabbing his eyes out
    10+ Year Member

    Joined:
    Jun 7, 2008
    Messages:
    874
    Likes Received:
    58
    Each cycle only starts with 1 CO2 and 1 RuBP (not 3), so it takes 6 cycles to produce a glucose.

    I don't have my textbook with me, but I think Mg is just a component of the chlorophyll pigment, while the H+ concentration difference across the lumen and thylakoid membrane of the chloroplast creates an electrochemical gradient that makes chemiosmosis, and hence ATP production, possible.
     
    #2 Svart Aske, Jan 7, 2009
    Last edited: Jan 7, 2009

Share This Page