I need help solving these questions. I think that is the answer but I would like

Question

I need help solving these questions. I think that is the answer but I would like to know how to solve it and why the others cannot be the answer. Thank you!

18. Hormone activated phosholipase C can convert physphatidylinositol 4,5 bisphosphate to: a. diacylglycerol inositol 2 phosphates. b. glycerol inositol phosphate. c. glycerol phosphoserine d. diacylglycerol inositito-trisphosphate. 19. Which of the following reactions in glycolysis requires ATP as a substrate: a. Aldolase. b. Hexokinase. c. Pyuvate kinase. d. Glyceraldehyde-3-P dehydrogenase. e. Protein Kinase A. 20. Which of the following reactions in glycolysis produces ATP as a product a. Aldolase. b. Hexokinase. c. Pyruvate kinase. d. Glyceraldehyde-3-P dehydrogenase. e. Protein Kinase A.

Explanation / Answer

Answer :

Q 18. The correct option is D ( Diacyglycerol and IP3)

Q19. The correct option is B ( Hexokinase). Hexokinase is the enzyme that phosphorylates the glucose to form glucose 6- phosphate. This needs ATP which acts as a phosphoryl group donor. The reactions catalysed by the remaining enzymes does not reuire ATP as substrate.

Q20. The correct answer is C (Pyruvate kinase). Pyruvate kinase brings about the substrate level phosphorylation that results in the formation of pyruvate from phosphoenolpyruvate. This reaction results in the formation of ATP molecule.

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