Question

1.) Which of the following is the substrate or product of the reactions that comprise the oxidative phase of the pentose phosphate pathway? A) glyceraldehyde-3-phosphate B) Ribulose-5-phosphate C) Seduheptulose - 7 - phosphate D) Ribose-5-phosphate

2) The regulated reactions of gluconeogenesis have/are A) Activated by molecules indicating a low energy charge in the cell B) reversible reactions C) those thare counter to regulated reactions in glycolysis D)Large positive change in G values

3) The biosynthesis of triacylglycerols in animals uses which citrate cycle intermediate in the liver. A) Isocitrate B) Malate C) Acetyl CoA D) Succinate

4) Which hormone slows down glycolysis while stimulating gluconeogenesis through the phosphorylation of phosphofructokinase and fructose 2,6-biphosphatase? A) Glycogen B) ATP C) insulin D) Protein kinase

Answer 1

Question 1. Answer is option D that is the main product or substrate of oxidative phase of pentose phosphate pathway is ribose-5-phosphate. Glucose-6-phosphate is converted into ribose-5-phosphate is the product of oxidative phase of pentose phosphate pathway.

Question 2. Answer is option A that is gluconeogenesis regulated by the glucagon means when there is low energy in the cell the then glucagon binds to glycogen receptor and convert it into the glucose molecules and increases the cells energy.

Question 3. Answer is option C that is Acetyl CoA, the main key enzyme of citric acid cycle Acetyl CoA synthase used in triglycerols synthesis,acts as precursor.

Question 4. Answer is option D that is protein kinase inhibit glycolysis by stimulation gluconeogenesis.