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 (D)</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 (A)</p> Signup and view all the answers

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

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

Which of the following is a major antioxidant enzyme?

<p>Catalase (A)</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 (A)</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 (C)</p> Signup and view all the answers

What happens when a covalent bond between entities is broken?

<p>Formation of free radicals (B)</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) (C)</p> Signup and view all the answers

What is the result when free radicals combine?

<p>Reformation of the original compound (A)</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 (B)</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) (B)</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 (D)</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 (B)</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) (A)</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 (B)</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 (C)</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 (B)</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 (A)</p> Signup and view all the answers

What happens when a covalent bond between entities is broken?

<p>Free radicals are formed (D)</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 (A)</p> Signup and view all the answers

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