Unit 4

Unit 4
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  • Floating in the air was a carbon dioxide molecule. This carbon dioxide molecule was about to enter the stomata of one of the leaves on the ground, prompting photosynthesis to occur. 
  • As the carbon dioxide molecule entered the stomata, photosynthesis began to occur. Along with absorbing the carbon dioxide, the plant also absorbed water from the atmosphere. High energy electrons leave the chlorophyll and enter the electron transport chain. Then enzymes break down the water molecules into H+ and O and oxygen is given off as a waste product. The electrons then are combined with NADP to make NADPH. ADP then converts into ATP. 
  • In the calvin cycle, CO2 molecules are added to  5 carbon molecules to create 6 carbon molecules. ATP and NADPH split the 6 carbon molecules into 3 carbon molecules. One of these molecules then leaves the cycle while the others remain. ATP then changes the other 3 carbon molecules left in the cycle back into 5 carbon molecules. Finally, when 2/3 of the carbon molecules leave the cycle, they form a 6 carbon sugar like glucose. 
  • As mentioned in the previous question, carbon dioxide is also utilized in cellular respiration. Once in the stomata, carbon dioxide assists in this process. It first becomes prevalent in during the oxidization of pyruvate. Again, this takes place in the inter membrane space of the mitochondria. The pyruvate loses a carbon dioxide molecule and NADH is produced and the pyruvate gets converted into acetyl coenzyme a.
  • Afterwards, the citric acid cycle occurs, which takes place in the matrix of the mitochondria. A four carbon molecule is combined with the acetyl coenzyme a and citric acid is formed. The citric acid then loses a carbon molecule and combines with oxygen. NADH is then formed, as well as ATP and FADH.
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