Citric Acid Cycle Steps Review
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Questions and Answers

Which enzyme is responsible for the conversion of succinate to fumarate in the TCA cycle?

  • Succinyl CoA synthetase
  • Fumarase (correct)
  • Succinate synthase
  • Aconitase
  • Which step in glycolysis produces ATP?

  • Conversion of glyceraldehyde 3-phosphate to 1,3 bisphosphoglycerate (correct)
  • Conversion of glucose to glucose 6-phosphate
  • Conversion of 3 phosphoglycerate to 2 phosphoglycerate
  • Conversion of fructose 6-phosphate to fructose 1,6-bisphosphate
  • Which enzyme is involved in the conversion of acetoacetyl CoA to 3-hydroxy-3-methylglutaryl-CoA in ketone body synthesis?

  • 3-hydroxybutyrate dehydrogenase
  • HMG-CoA lyase
  • Acetoacetyl CoA thiolase
  • HMG-CoA synthase (correct)
  • Which molecule serves as the central/branch point in metabolism?

    <p>Acetyl CoA</p> Signup and view all the answers

    Which process involves the conversion of acetyl CoA to citrate for storage?

    <p>TCA cycle</p> Signup and view all the answers

    Which enzyme is involved in converting glucose to glucose 6-phosphate in glycolysis?

    <p>(2) Glucose → Glucose 6-phosphate through Hexo/Glucokinase</p> Signup and view all the answers

    Which amino acid enters the TCA cycle at a point where 2 NADH have already been produced?

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

    Which substance is NOT produced by the TCA cycle?

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

    What are the reduced electron carriers produced by the TCA cycle used for?

    <p>Electron transport chain (ETC) to make ATP</p> Signup and view all the answers

    Which enzyme is responsible for the conversion of acetyl CoA to citrate in the TCA cycle?

    <p>Citrate synthase</p> Signup and view all the answers

    During glycolysis, which step involves the conversion of fructose 6-phosphate to fructose 1,6-bisphosphate?

    <p>Step Three</p> Signup and view all the answers

    Which enzyme is involved in the formation of 3-hydroxybutyrate during ketone body synthesis?

    <p>3-hydroxybutyrate dehydrogenase</p> Signup and view all the answers

    Which amino acids can be converted to glutamate and then to α-ketoglutarate for entry into the TCA cycle without the need for additional NADH production?

    <p>Arginine, Histidine, Glutamine, Proline</p> Signup and view all the answers

    Which nutrient can be stored as citrate after being pulled out from the TCA cycle?

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

    Which enzyme is responsible for the conversion of succinyl CoA to succinate in the TCA cycle?

    <p>Succinyl CoA synthetase</p> Signup and view all the answers

    Which step of glycolysis involves the production of 2 ATP?

    <p>Step Seven</p> Signup and view all the answers

    Which enzyme is involved in the formation of acetoacetyl CoA during ketone body synthesis?

    <p>Acetoacetyl CoA thiolase</p> Signup and view all the answers

    Which amino acids can be converted to propionyl CoA and then to succinyl CoA for entry into the TCA cycle after 2 NADH have already been produced?

    <p>Isoleucine, Valine, Methionine, Threonine</p> Signup and view all the answers

    Which nutrient can be converted to pyruvate before entering the TCA cycle?

    <p>Amino acids</p> Signup and view all the answers

    Which enzyme is responsible for the conversion of malate to oxaloacetate in the TCA cycle?

    <p>Malate dehydrogenase</p> Signup and view all the answers

    Where do the reduced electron carriers (NADH, FADH2) from the TCA cycle go in order to generate ATP?

    <p>Electron transport chain (ETC)</p> Signup and view all the answers

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