anonymous
  • anonymous
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?
Biology
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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bahrom7893
  • bahrom7893
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.
anonymous
  • anonymous
I already read that. I want to REFINE that answer. Did you even read what i said?
bahrom7893
  • bahrom7893
sorry i thought u didn't and it might help. Honestly i barely know anything about bio.

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anonymous
  • anonymous
its okay i just dont know what to do...
bahrom7893
  • bahrom7893
@KingGeorge were you horrible at biology too? Or was it just chemistry? If it was, can you help her out?
KingGeorge
  • KingGeorge
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.

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