COPY: Nucleotides Structure and Composition
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Questions and Answers

What is the basic unit structure of nucleic acids?

  • Polynucleotides
  • Amino acids
  • Nucleotides (correct)
  • Pentose sugar

    • Which of the following nitrogenous bases has a single ring structure?

  • Cytosine
  • Thymine and Uracil (correct)
  • Adenine
  • Guanine

    • What is the charge of the sugar-phosphate backbone in a polynucleotide chain?

  • Variable
  • Neutral
  • Positive
  • Negative (correct)

    • What is the characteristic of a free radical?

    <p>Highly reactive and short-lived</p> Signup and view all the answers

    What is the result of incomplete oxygen reduction?

    <p>Production of ROS</p> Signup and view all the answers

    What is a characteristic of H2O2?

    <p>It is not a radical by definition</p> Signup and view all the answers

    What is the term used to describe tissue damage caused by oxygen radicals?

    <p>Oxidative damage</p> Signup and view all the answers

    What is the primary function of antioxidants in the body?

    <p>To protect against cellular injury by ROS or other oxidants</p> Signup and view all the answers

    What type of antioxidant is Vitamin E?

    <p>Fat-soluble</p> Signup and view all the answers

    Which antioxidant is 20 times stronger than Vitamin C and 50 times stronger than Vitamin E?

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

    What is the ability of antioxidants like Vitamin C to reactivate themselves?

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

    Which antioxidant is able to cross the blood-brain barrier?

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

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