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Practice - Pentose Phosphate Path quiz

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  • What does transketolase transfer during the pentose phosphate pathway?
    Transketolase transfers 2 carbons from xylulose 5-phosphate to ribose 5-phosphate.
  • What are the products when transketolase acts on xylulose 5-phosphate and ribose 5-phosphate?
    The products are pseudoheptulose 7-phosphate and glyceraldehyde 3-phosphate (G3P).
  • Which enzyme transfers 3 carbons from pseudoheptulose 7-phosphate to glyceraldehyde 3-phosphate?
    Transaldolase transfers 3 carbons from pseudoheptulose 7-phosphate to glyceraldehyde 3-phosphate.
  • What are the products of the transaldolase reaction in the pentose phosphate pathway?
    The products are erythrose 4-phosphate and fructose 6-phosphate.
  • Which molecule produced in the pentose phosphate pathway is a precursor for aromatic amino acids?
    Erythrose 4-phosphate is a precursor for aromatic amino acids.
  • What is ribose 5-phosphate used for in biosynthesis?
    Ribose 5-phosphate is used to produce histidine and nucleotides.
  • Which enzyme converts 6-phosphogluconate to ribulose 5-phosphate?
    6-phosphogluconate dehydrogenase converts 6-phosphogluconate to ribulose 5-phosphate.
  • What is the significance of 6-phosphogluconate dehydrogenase in the pentose phosphate pathway?
    It catalyzes the decarboxylation of 6-phosphogluconate, producing ribulose 5-phosphate and CO2.
  • Which carbon of glucose is most rapidly released as CO2 in the pentose phosphate pathway?
    Carbon 1 of glucose is most rapidly released as CO2 during the decarboxylation of 6-phosphogluconate.
  • What is the fate of carbon 1 from glucose in the pentose phosphate pathway?
    It is released as CO2 during the conversion of 6-phosphogluconate to ribulose 5-phosphate.
  • Which glycolytic enzymes are NOT involved in the pentose phosphate pathway?
    Glycogen phosphorylase, aldolase, phosphofructokinase, and pyruvate kinase are not involved.
  • What is the main function of the pentose phosphate pathway?
    It provides precursors for amino acid biosynthesis and nucleotide synthesis.
  • How is ribose 5-phosphate generated in the pentose phosphate pathway?
    Ribose 5-phosphate is generated by the isomerization of ribulose 5-phosphate.
  • Which step in the pentose phosphate pathway involves decarboxylation?
    The conversion of 6-phosphogluconate to ribulose 5-phosphate involves decarboxylation.
  • What glycolytic intermediate is produced by the pentose phosphate pathway and can re-enter glycolysis?
    Fructose 6-phosphate is produced and can re-enter glycolysis.