The molecule formed after first phosphorylation during glycolysis is:
Correct answer: D. Glucose-6-phosphate
- A. Fructose-6-phosphate
- B. Glucose-1-phosphate
- C. Fructose-1, 6-bisphosphate
- D. Glucose-6-phosphate
Explanation
Explanation:When glucose enters the Cytoplasm, the first reaction of Glycolysis is addition of a phosphate molecule into the glucose forming glucose-6-phosphate. The reaction is catalyzed by hexokinase. Then Isomerase converts it to fructose-6-phosphate and phosphofructokinase carries out the second phosphorylation converting it to fructose-1,6-phosphate.
This question appeared on the UHS MDCAT 2009 paper, which you can sit online with every answer explained.
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About Cellular Respiration
Cellular respiration releases energy from glucose through glycolysis, the link reaction, the Krebs cycle and the electron transport chain, producing ATP. The pathway differs in oxygen availability: aerobic respiration uses oxygen and yields more ATP, while anaerobic respiration produces much less ATP and forms lactic acid in muscles or ethanol and carbon dioxide in yeast.
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