Enzyme Classifications Quiz
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Questions and Answers

Which group transfer excluding hydrogen or oxygen involves a reaction with cytochrome or heme protein?

  • Aldehyde or ketone
  • Alcohol
  • Nitrogenous compound
  • Diphenols or related (correct)
  • What is the primary function of flavin in group transfer reactions?

  • Incorporating two O (correct)
  • Acceptor of hydrogen or electron
  • Acting on superoxide
  • Donor of hydrogen or electron
  • In group transfer reactions involving iron-sulfur-proteins, what is the nature of the group transferred?

  • -COR group
  • Sulfur group (correct)
  • Phosphate group
  • 1-Carbon group
  • Which acceptor of hydrogen or electron is commonly associated with quinone or similar compounds in group transfer reactions?

    <p>NAD+ or NADP+ or peroxide</p> Signup and view all the answers

    When acting on CH or CH2 groups, which type of oxidoreductase is most likely to utilize flavin in the reaction?

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

    Group transfer reactions involving iron-sulfur-proteins often include the transfer of which type of group?

    <p>Selenium-containing groups</p> Signup and view all the answers

    What type of cofactor is involved in cytochrome oxidase?

    <p>Cu2+</p> Signup and view all the answers

    Which enzyme requires Fe as a cofactor among the given examples?

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

    Which enzyme listed requires K+ and Mg2+ as cofactors in addition to Na+?

    <p>Plasma membrane ATPase</p> Signup and view all the answers

    Which enzyme relies on Fe or Fe-S clusters as cofactors?

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

    Among the listed enzymes, which one is likely to be associated with quinone as a cofactor?

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

    In heme proteins, the iron atom is typically coordinated by which of the following?

    <p>Sulfur atoms of cysteine residues</p> Signup and view all the answers

    Which class of enzymes is responsible for the transfer of hydrogen or oxygen atoms or electrons from one substrate to another, such as oxidases or dehydrogenases?

    <p>Class 1: Oxidoreductases</p> Signup and view all the answers

    Which type of chemical reaction does lactic acid dehydrogenation involve?

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

    Which enzyme is responsible for the conversion of lactic acid to pyruvic acid?

    <p>Lactic Acid Dehydrogenase</p> Signup and view all the answers

    In the new systematic scheme by the International Enzyme Commission in 1964, how many main classes of enzymes were categorized?

    <p>Six main classes</p> Signup and view all the answers

    Which metal ion is commonly found in iron-sulfur proteins as a cofactor?

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

    Which of the following is an example of a heme protein?

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

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