Cellular Respiration: Glycolysis

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  • 1. Cellular Respiration Glycolysis Coy Stoker Axia CollegeCellular Respiration - Glycolysis

2. Cellular Respiration Glycolysis Stages of Glycolysis: Step 1: ATP Spent Step 2: Split Step 3: NAD +/ Phosphate Step 4: ATP Produced Cellular Respiration - Glycolysis 3.

  • Glycolysis is only one segment of cellular respiration (Pruitt, Underwood, 2005). Glycolysis is the most primitive of the types of cellular respiration. Glycolysis does not required oxygen so it is called anaerobic. There are four major steps in glycolysis. The process begins with a molecule of glucose. The glucose molecule is exposed to 2 ATP molecules which results in the glucose molecule picking up two phosphates. The result of this reaction is fructose diphosphate and two ADP molecules. Then fructose diphosphate is split into 2 glyceraldehyde phosphate (Respiration, n.d.). Then a free floating phosphate is added to each molecule of glyceraldehyde phosphate and NAD+ picks up a particle of hydrogen from each molecule of glyceraldehyde phosphate. The result of both of these reactions are 2 3-diphosphoglycerate . Finally both molecules of 3-diphosphoglycerate are exposed to 2 ADP a piece which result in 4 ATP. The net result of glycolysis is 2 ATP and 2 NADH.

Cellular Respiration - Glycolysis 4. ATP Spent Cellular Respiration - Glycolysis ATP ATP ADP ADP One phosphate from ATP added leaving ADP One phosphate from ATP added leaving ADP Fructose Diphosphate Before After 2 ATP Spent Next Glucose Phosphate 6 Carbon Glucose Fructose DiphosphateSplit 5.

  • During the first step in glycolysis there is actually a loss of two ATP. A phosphate is taken from both ATP in order to make the resultingfructose diphosphatemore reactive. This step also releases two ADP into the cellular plasma which will be used later.

Cellular Respiration - Glycolysis 6. Cellular Respiration - Glycolysis Split Split Glyceraldehyde Phosphate Glyceraldehyde Phosphate Before After Next Split Fructose Diphosphate Glyceraldehyde Phosphate NAD + /Phosphate 7.

  • The second step is simply splittingfructose diphosphatewhich makes 2glyceraldehyde phosphate . By doing this glycolysis is able to double the amount of ATP produced.

Cellular Respiration - Glycolysis 8. Cellular Respiration - Glycolysis NAD + / PhosphateGlyceraldehyde Phosphate Glyceraldehyde Phosphate NAD + NADH NAD + NADH Phosphate Phosphate 3-Diphosphoglycerate 3-Diphosphoglycerate Before After Next -H/+Ph Glyceraldehyde Phosphate 3-Diphosphoglycerate 4 ATPs Produced 9.

  • The third step entails harvesting ahydrogenmolecule from eachglyceraldehyde phosphateand adding it to NAD +making NADH, which is used later on in cellular respiration. Also a free floating phosphate is added toglyceraldehyde phosphateto make 23-diphosphoglycerate .

Cellular Respiration - Glycolysis 10. Cellular Respiration - Glycolysis ATP Produced 3-Diphosphoglycerate 3-Diphosphoglycerate ADP ATP ATP ADP Glyceraldehyde Phosphate Glyceraldehyde Phosphate ADP ATP ATP ADP Pyruvate Pyruvate ADPs steal four phosphates making four ATPs Before After 3-Diphosphoglycerate Pyruvate 11.

  • The third step entails harvesting ahydrogenmolecule from eachglyceraldehyde phosphateand adding it to NAD +making NADH, which is used later on in cellular respiration. Also a free floating phosphate is added toglyceraldehyde phosphateto make 23-diphosphoglycerate .

Cellular Respiration - Glycolysis 12. References

  • Respiration.(n.d.) Retrieved January 16, 2007, from BioInquiries Website:
  • http://higheredbcs.wiley.com/legacy/college/pruitt/0471473219/bioinquiries/ch10/bioinquiry_section_10_3.html
  • Pruitt, P.L., Underwood, L.S. (2005).BioInquiry: Making Connections in Biology.Danvers, MA: Wiley.

Cellular Respiration - Glycolysis