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

What is the result of incomplete oxygen reduction?

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

What is a characteristic of H2O2?

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

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

<p>Oxidative damage (D)</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 (C)</p> Signup and view all the answers

What type of antioxidant is Vitamin E?

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

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

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

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

<p>Flavanoids (B)</p> Signup and view all the answers

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