Edexcel A Level Biology Training Exam Fully Solved 2024.

Which stage of aerobic respiration produces 4 molecules of CO2 per glucose? - Answer The Krebs Cycle How is glucose converted into pyruvate in Glycolysis? - Answer Glucose is phosphorylated with ATP and then broken into Gylcerate -3-phosphate. Then it is converted into Pyruvate using NAD producing NADH and ATP. Where does glycolysis occur? - Answer Cytoplasm Why does glycolysis occur in the cytoplasm? - Answer The glucose molecules are too big to fit into the mitochondria but Pyruvate is. Where does the Krebs cycle occur? - Answer Matrix of mitochondria How is NADH formed during the link reaction? - Answer NAD is reduced and gains a H+ and e- from the Pyruvate. How is Coenzyme A formed? - Answer Pyruvate is decarboxylated and a CO2 molecule is formed (per pyruvate) - Answer