Electron Transport Chain Enzymes Quiz
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Questions and Answers

What is the amount of ATP formed when protons and electrons enter the ETC from the FADH2+ coenzyme?

  • 2
  • 12 (correct)
  • 3
  • 38
  • Which complex is involved in the synthesis of ATP in oxidative phosphorylation?

  • Creatine kinase
  • Dehydrogenase
  • Phosphatase
  • ATP synthase (correct)
  • What occurs when tissue respiration and oxidative phosphorylation are uncoupled?

  • The formation of ATP decreases and the release of energy in the form of heat increases (correct)
  • Both the release of energy in the form of heat and the formation of ATP are reduced
  • Both the release of energy in the form of heat and the formation of ATP increase
  • The formation of ATP increases and the release of energy in the form of heat decreases
  • Which compound is an inhibitor of tissue respiration and oxidative phosphorylation?

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

    What process occurs after the isolation of tissue respiration uncouplers?

    <p>ATP synthesis slows down</p> Signup and view all the answers

    What process leads to the disappearance of the electrochemical potential and the termination of ATP synthesis?

    <p>Uncoupling of tissue respiration and oxidative phosphorylation</p> Signup and view all the answers

    Which vitamin is responsible for inactivating an oxidized product, a lipid radical, by electron transfer?

    <p>Vitamin B</p> Signup and view all the answers

    What is the phenomenon characterized by a sharp increase in oxygen consumption in phagocytic cells?

    <p>Respiratory burst</p> Signup and view all the answers

    Which enzyme converts arginine to citrulline in macrophages?

    <p>Nitric oxide synthase</p> Signup and view all the answers

    What enzyme is involved in the formation of peroxynitrite ONOO- from NO with strong bactericidal properties?

    <p>Superoxide dismutase</p> Signup and view all the answers

    Which compound is necessary for the conversion of O2 to H2O2 and forms O2- and OH- for bacterial cell destruction?

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

    What particles are involved in protecting the body from bacteria in phagocytic cells?

    <p>Superoxide and hydroxyl radical</p> Signup and view all the answers

    What feature distinguishes cytochrome oxidase from other enzymes in the electron transport chain?

    <p>Presence of Cu^2+</p> Signup and view all the answers

    Which enzyme of the respiratory chain contains cytochromes a and a3?

    <p>Cytochrome oxidase</p> Signup and view all the answers

    Which enzyme in the electron transport chain has an active center that includes atoms of iron and copper?

    <p>Cytochrome oxidase</p> Signup and view all the answers

    What is the final electron acceptor in the respiratory chain?

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

    Which enzyme in the electron transport chain does not contain cytochromes?

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

    Which compound, synthesized from an intermediate product of glycolysis, plays a significant role in regulating oxygen binding to hemoglobin?

    <p>2,3-Bisphosphoglycerate (2,3-BPG)</p> Signup and view all the answers

    Which compound in erythrocytes reduces the affinity of hemoglobin for oxygen by binding to the central cavity of the hemoglobin tetramer?

    <p>2,3-Bisphosphoglycerate (2,3-BPG)</p> Signup and view all the answers

    What is the primary regulator of oxygen binding to hemoglobin in tissues, promoting the release of oxygen from hemoglobin?

    <p>CO2 / H+</p> Signup and view all the answers

    How does an increase in the concentration of H+ affect the affinity of hemoglobin for oxygen?

    <p>Decreases affinity</p> Signup and view all the answers

    Which factor enhances the function of releasing oxygen from hemoglobin in tissues?

    <p>Low PO2</p> Signup and view all the answers

    Which regulator enhances the function of releasing oxygen from hemoglobin in tissues?

    <p>Increase in hydrogen ion (H+)</p> Signup and view all the answers

    Which amino acid residues in deoxyhemoglobin protomers bind to 2,3 bisphosphoglycerate?

    <p>Positively charged amino acids</p> Signup and view all the answers

    What are the conditions for accelerating the formation of 2,3 bisphosphoglycerate in erythrocytes?

    <p>Decrease in PO2</p> Signup and view all the answers

    Which compound is the hydrogen atom donor in the reduction of glutathione (GSSG → 2 G-SH)?

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

    What is the process occurring in erythrocytes that causes a change in the hemoglobin polypeptide chain with an increase in the content of reactive oxygen species?

    <p>Oxidation of S-H group</p> Signup and view all the answers

    Which enzyme converts 1,3 bisphosphoglycerate to 2,3 bisphosphoglycerate in red blood cells?

    <p>Bisphosphoglycerate mutase</p> Signup and view all the answers

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