Quantcast

A community for students. Sign up today!

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

Turner

  • 2 years ago

What happens to the carbon atom during photosynthesis? I have to write about the "travels" of a carbon atom. Concerning photosynthesis, however, I don't know how to make the explanation brief. I know it has to do something with the Calvin Cycle, but I can't write the whole Calvin Cycle out. Help?

  • This Question is Closed
  1. bahrom7893
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    The Calvin cycle may be divided into 3 steps. Step 1: Carbon Fixation. This phase begins when a carbon dioxide molecule is attached to a 5 carbon sugar, ribulose biphosphate (RuBP). This reaction is catalyzed by the enzyme RuBP carboxylase (rubisco) one of the most abundant proteins on earth. The products of this reaction is an unstable 6 carbon compound that immediately splits into 2 molecules of 3-phosphoglycerate. For every 3 molecules of carbon dioxide that enter the cycle via rubisco, 3 RuBP molecules are carboxylated forming 6 molecules of 3-phosphoglycerate. Step 2: Reduction. This endergonic reduction phase is a 2 step process that couples ATP hydrolysis with the reduction of 3-phosphoglycerate to glyceraldehyde phosphate. An enzyme phosphorylates (adds a phosphate) 3-phosphoglycerate by transferring a phosphate from the ATP. The product is 1-3-bisphosphoglycerate. Electrons from the NADPH reduce the carboxyl group of the 1-3-bisphosphoglycerate to the aldehyde group of glyceraldehyde-3-phosphate. For every three carbon dioxide molecules that enter the Calvin cycle, 6 glyceraldehyde-3-phosphates are produced, only one can be counted as a net gain. The other 5 are used to regenerate 3 molecules of RuBP. Step 3: Regeneration of RuBP. A complex series of reactions rearranges the carbon skeletons of 5 glyceraldehyde-3-phosphate molecules into 3 RuBP molecules. These reactions require 3 ATP molecules. RuBP is thus regenerated to begin the cycle again. Sources: http://answers.yahoo.com/question/index?qid=20110913131907AAmH1v3 and obv Google.

  2. Turner
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    I already read that. I want to REFINE that answer. Did you even read what i said?

  3. bahrom7893
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    sorry i thought u didn't and it might help. Honestly i barely know anything about bio.

  4. Turner
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    its okay i just dont know what to do...

  5. bahrom7893
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    @KingGeorge were you horrible at biology too? Or was it just chemistry? If it was, can you help her out?

  6. KingGeorge
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Sorry, I used to be decent at bio, but it's been 6 years since I took a bio course, and can't remember anything.

  7. Not the answer you are looking for?
    Search for more explanations.

    Search OpenStudy
    • Attachments:

Ask your own question

Ask a Question
Find more explanations on OpenStudy

Your question is ready. Sign up for free to start getting answers.

spraguer (Moderator)
5 → View Detailed Profile

is replying to Can someone tell me what button the professor is hitting...

23

  • Teamwork 19 Teammate
  • Problem Solving 19 Hero
  • You have blocked this person.
  • ✔ You're a fan Checking fan status...

Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.

This is the testimonial you wrote.
You haven't written a testimonial for Owlfred.