Pentose Phosphate Pathway (PPP) Quiz
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Questions and Answers

Why is GSH essential for normal RBC structure?

  • To keep hemoglobin in the ferric state
  • To promote the synthesis of nucleic acids
  • To increase susceptibility to hemolysis
  • To detoxify peroxides (correct)
  • What is the significance of CO2 produced from the pentose phosphate pathway?

  • Promotes RBC synthesis
  • Utilized for CO2 fixation reactions (correct)
  • Enhances ATP production
  • Increases susceptibility to hemolysis
  • Which of the following is a clinical manifestation of low levels of GSH?

  • Pale skin
  • Black urine (correct)
  • Low platelet count
  • Jaundice
  • Which factor strongly inhibits glucose 6-phosphate dehydrogenase (G6PD)?

    <p>Increased NADPH levels</p> Signup and view all the answers

    What induces the synthesis of glucose 6-phosphate dehydrogenase after a high carbohydrate meal?

    <p>Increased insulin/glucagon ratio</p> Signup and view all the answers

    What is the clinical significance of Glucose-6-phosphate dehydrogenase (G6PD) deficiency?

    <p>Favism, an X-linked disorder</p> Signup and view all the answers

    Which pathway produces CO2 as a byproduct?

    <p>HMP pathway</p> Signup and view all the answers

    Which of the following is an occurrence of the HMP pathway?

    <p>Active in liver, adipose tissue, and pancreas</p> Signup and view all the answers

    Which pathway utilizes ATP as well as produces it?

    <p>Glycolysis</p> Signup and view all the answers

    What is the biological significance of the HMP pathway?

    <p>All of the above</p> Signup and view all the answers

    In which form are intermediates found in the HMP pathway?

    <p>Mono or bisphosphate forms</p> Signup and view all the answers

    What is the consequence of decreased G6PD activity in red blood cells?

    <p>Accumulation of methemoglobin and peroxides</p> Signup and view all the answers

    Which triggers can lead to the development of acute hemolytic anemia in individuals with G6PD deficiency?

    <p>Certain antibiotics</p> Signup and view all the answers

    What is the association between G6PD deficiency and malaria?

    <p>Resistance to malaria infection</p> Signup and view all the answers

    Which coenzyme is required by the enzyme Transketolase during the non-oxidative phase?

    <p>Thiamine pyrophosphate (vitamin B1)</p> Signup and view all the answers

    What is the clinical significance of measuring R.B.C Transketolase activity?

    <p>As an index of thiamine status</p> Signup and view all the answers

    In what condition is Wernicke's encephalopathy commonly seen?

    <p>In alcoholics or those with chronic thiamine deficiency</p> Signup and view all the answers

    What is the role of NADPH in preventing Met-Hemoglobinemia?

    <p>Maintaining iron in hemoglobin in the reduced state</p> Signup and view all the answers

    Which function does reduced glutathione (GSH) serve in cells?

    <p>Serving as a reductant</p> Signup and view all the answers

    What is the main mechanism by which glutathione protects cells against highly reactive oxygen derivatives?

    <p>Regenerates GSH from its oxidized form</p> Signup and view all the answers

    In what way is NADPH involved in the process of protecting cells against ROS?

    <p>Destroying hydrogen peroxide and hydroxyl free radicals</p> Signup and view all the answers

    What is the composition of Glutathione (GSH)?

    <p>Glutamate, cysteine, glycine</p> Signup and view all the answers

    What role does reduced glutathione (GSH) play in maintaining the normal reduced state of RBCs?

    <p>Maintaining cysteine residues in hemoglobin and other proteins in a reduced state</p> Signup and view all the answers

    What is the product of the oxidative non-reversible phase of the pentose phosphate pathway?

    <p>Ribulose 5-p</p> Signup and view all the answers

    Which enzyme is responsible for the transfer of the 2-C fragment during the HMP-Shunt pathway?

    <p>Transketolase</p> Signup and view all the answers

    What compound is converted back to Glucose 6-p in the non-oxidative reversible phase of the pentose phosphate pathway?

    <p>Ribulose 5-p</p> Signup and view all the answers

    Which molecule can enter the glycolytic pathway through the pentose pathway?

    <p>Erythrose 4-phosphate</p> Signup and view all the answers

    What molecules are generated by the oxidative non-reversible phase of the pentose phosphate pathway?

    <p>NADPH + H+</p> Signup and view all the answers

    Which enzyme is involved in dehydrogenation and decarboxylation during the first phase of the pentose phosphate pathway?

    <p>Glucose 6Pdehydrogenase</p> Signup and view all the answers

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