11th Grade Science Half-Yearly Exam Prep Quiz
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Questions and Answers

Which of the following is NOT a characteristic of a covalent bond?

  • Relatively low melting and boiling points
  • Sharing of electron pairs
  • Formation between non-metal atoms
  • High electrical conductivity (correct)

    • In the context of 11th-grade science, which of the following statements about enzymes is true?

  • Enzymes increase the activation energy of a reaction
  • Enzymes are consumed during chemical reactions
  • Enzymes are specific in their action (correct)
  • Enzymes only function in acidic environments

    • Which of the following is true about the structure of DNA?

  • Thymine is found in RNA but not in DNA
  • Adenine pairs with guanine in DNA
  • DNA has a double helix structure held together by hydrogen bonds (correct)
  • DNA is a single-stranded helix

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