Reactive Oxygen Species (ROS) and Oxidative Stress Quiz
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Questions and Answers

Which of the following is a characteristic of free radicals?

  • They do not participate in further reactions
  • They have a long half-life
  • They can only be quenched when two radicals react together (correct)
  • They can donate an electron to achieve stability

    • What is the role of oxidative stress?

  • To form free radicals
  • To cause major damage to macromolecules (correct)
  • To donate an electron to achieve stability
  • To protect against ROS formation and damage

    • Which of the following is a major antioxidant enzyme?

  • Oxygen
  • Iron
  • Nitrogen
  • Superoxide dismutase (correct)

    • Which of the following is a characteristic of free radicals?

    <p>They have a short half-life</p> Signup and view all the answers

    What is the role of reactive oxygen species (ROS) in the cell?

    <p>To participate in normal biochemical reactions</p> Signup and view all the answers

    What is the major impact of lipid peroxidation reactions on biological systems?

    <p>Damage to macromolecules</p> Signup and view all the answers

    Which of the following is a major antioxidant enzyme?

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

    What is the impact of oxidative stress on damage and disease?

    <p>Causing damage and leading to disease</p> Signup and view all the answers

    What is the definition of a free radical?

    <p>An atom with an unpaired electron in the outermost shell</p> Signup and view all the answers

    What happens when a covalent bond between entities is broken?

    <p>Formation of free radicals</p> Signup and view all the answers

    What is the main reason for the high chemical reactivity of free radicals?

    <p>Presence of unpaired electron(s)</p> Signup and view all the answers

    What is the result when free radicals combine?

    <p>Reformation of the original compound</p> Signup and view all the answers

    What is the function of antioxidants in relation to ROS?

    <p>To provide protection against ROS formation and damage</p> Signup and view all the answers

    Which of the following is a major reactive oxygen species (ROS) formed in the cell?

    <p>Hydrogen peroxide (H2O2)</p> Signup and view all the answers

    What is the impact of reactive oxygen species (ROS) on various biomolecules?

    <p>They cause major damage to biomolecules</p> Signup and view all the answers

    What is the result of lipid peroxidation reactions on biological systems?

    <p>They cause major damage to biological systems</p> Signup and view all the answers

    Which of the following is a major antioxidant enzyme that provides protection against ROS formation and damage?

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

    What is the role of oxidative stress in damage and disease?

    <p>It causes damage and contributes to the development of various diseases</p> Signup and view all the answers

    What is the major impact of lipid peroxidation reactions on biological systems?

    <p>They cause major damage to biological systems</p> Signup and view all the answers

    What is the function of antioxidants in relation to reactive oxygen species (ROS)?

    <p>They neutralize ROS and protect cells from their damaging effects</p> Signup and view all the answers

    What is the definition of a free radical?

    <p>An atom with an unpaired electron in the outermost shell</p> Signup and view all the answers

    What happens when a covalent bond between entities is broken?

    <p>Free radicals are formed</p> Signup and view all the answers

    What is the main reason for the high chemical reactivity of free radicals?

    <p>They have unpaired electrons</p> Signup and view all the answers

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