Metabolism Module 2 Topic 5: The Pentose Phosphate Pathway

14 flashcards · Other · by Haroon Chehabzada

1. What are the three main functions of the pentose phosphate pathway (PPP)?

   The three main functions of the PPP are the synthesis of NADPH for reductive biochemistry, provision of ribose-5-phosphate for nucleotide and nucleic acid biosynthesis, and metabolism of dietary pentose sugars derived from nucleic acid digestion.

2. Q: How many phases does the PPP have?

   The PPP has two phases: oxidative and non-oxidative.

3. What does the oxidative phase of the PPP produce?

   The oxidative phase of the PPP results in the production of NADPH and CO2 from glucose-6-phosphate by a series of enzymatic reactions.

4. What is the non-oxidative phase of the PPP involved in?

   The non-oxidative phase of the PPP involves the recycling of ribose-5-phosphate and other sugars back into glycolysis or the oxidative phase of the PPP.

5. What is the role of the PPP in providing cells with reducing power?

   The PPP plays an important role in providing cells with a source of reducing power in the form of NADPH.

6. What can the PPP produce for the synthesis of DNA and RNA?

   The PPP can also produce ribose-5-phosphate for the synthesis of DNA and RNA.

7. What does the pentose phosphate pathway generate through its non-oxidative phase?

   The non-oxidative phase of the pentose phosphate pathway generates ribulose-5-phosphate, ribose-5-phosphate, nucleotides, and coenzymes.

8. What enzymes are used in the non-oxidative phase of the pentose phosphate pathway?

   The non-oxidative phase of the pentose phosphate pathway uses transketolase and transaldolase to interconvert 5-carbon and 3-carbon molecules.

9. What is produced in the oxidative phase of the pentose phosphate pathway?

   The oxidative phase of the pentose phosphate pathway produces NADPH and CO2 from glucose-6-phosphate through a series of enzymatic reactions.

10. How does the PPP tailor its products?

    The pentose phosphate pathway tailors its products to specific needs, such as generating nucleotides or synthesizing energy.

11. Why is the PPP important in red blood cells?

    The PPP is important in red blood cells for generating NADPH to protect against oxidative damage caused by peroxides through glutathione peroxidase.

12. What does the given text appear to be describing?

    The given text appears to be describing a chemical pathway chart of the pentose phosphate pathway and nucleotide synthesis.

13. What does the pentose phosphate pathway produce?

    The pentose phosphate pathway produces NADPH, which is further utilized in biosynthetic reactions such as fatty acid and cholesterol synthesis.

14. Where is fructose 6-phosphate formed in the pentose phosphate pathway directed to?

    Fructose 6-phosphate formed in the pentose phosphate pathway is directed via glycolysis for fatty acid synthesis.