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  1. #1 -> C3H6O3 <- 
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    I'm in 9th grade pre-Ap biology and I was looking over photosynthesis when I hit a wall with this:
    C3H6O3- as put in the book is a sugar produced by plants.
    But on internet sources it is a lactic acid...
    My text book says nothing about lactic acid and I am on a break from school so I can't ask the teacher.
    trying to figure out if lactic acid was a form of sugar or not proved futile
    so!
    is lactic acid glucose? If not then please, wtf?

    its more than likely a very stupid question!


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    • #2  
      Moderator Moderator AlexP's Avatar
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      umm...lactic acid is not a sugar and is not glucose. The formula of glucose is C<sub>6</sub>H<sub>12</sub>O<sub>6</sub>. Go through that part of the book again and make sure you're not getting things mixed up... Lactic acid comes up in the anaerobic pathway of respiration but as far as I can tell it doesn't appear at all in the photosynthesis process.


      "There is a kind of lazy pleasure in useless and out-of-the-way erudition." -Jorge Luis Borges
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    • #3  
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      These events occur in two groups of reactions, summarized in figure 4.7. In the light reactions, pigment molecules in the thylakoids absorb light and convert it to chemical energy carried by short lived, energy-rich molecules. The energy of these molecules is used to make 3-carbon sugars from carbon dioxide in a series of reactions known as the calvin cycle. The chemical energy and carbon skeletons of the sugars are available to the plant for future growth/

      The following equation summarizes the overall reactions of photosynthesis.

      3 CO2 + 3 H2O ------> "C3H6O3 + 3 O2
      carbon water 3-carbon oxygen
      dioxide sugar gas

      Thats an exact quote from the book

      I hope you can help me

      all the places i look at (besides the book) say that C3H6O3 is a lactic acid
      look at these two links before you reply as well..
      http://www.chem.purdue.edu/gchelp/molecules/lacta.gif
      and
      http://academic.brooklyn.cuny.edu/bi...age/triose.jpg

      They look strikingly similar to me
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      Moderator Moderator AlexP's Avatar
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      Take a closer look at the molecules in the links. The one in the first link isn't the same as the one on the left side in the second link. I'd believe the book. I don't know triose sugars off the top of my head so I didn't think of that, but if the book says that I don't doubt it. This is an example of isomerism - the situation where two molecules can have the same molecular formula but different structural formulas. So C<sub>3</sub>H<sub>6</sub>O<sub>3</sub> doesn't have to lactic acid, it can be those triose sugars that the second link shows as well.
      "There is a kind of lazy pleasure in useless and out-of-the-way erudition." -Jorge Luis Borges
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      thank you.
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      From a lazy search of Wikipedia I have discovered that your mystery molecule is probably a prelude to 3-Phosphoglyceric acid, if you in fact choose to believe Wiki . The link is below, it may lead you to more concrete evidence:

      http://en.wikipedia.org/wiki/3-phosphoglycerate
      Dramatisation; may not have happened.
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