Chemical Composition of Living Organisms
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Questions and Answers

Which elements are the most common in the human body?

  • Oxygen, Carbon, Hydrogen, Nitrogen
  • Carbon, Hydrogen, Oxygen & Nitrogen (correct)
  • Calcium, Magnesium, Iron, Chlorine
  • Sulphur, Phosphorous, Sodium, Potassium

    • What distinguishes organic compounds from inorganic compounds?

  • Organic compounds have more elements than inorganic compounds
  • Inorganic compounds contain Carbon; organic compounds do not
  • Organic compounds contain Carbon; inorganic compounds do not (correct)
  • Inorganic compounds have more forms than organic compounds

    • Which element is NOT listed as one of the most common elements in the human body?

  • Hydrogen
  • Oxygen
  • Sodium (correct)
  • Carbon

    • What type of compounds build up the living body?

    <p>Biological molecules</p> Signup and view all the answers

    What percentage of the human body is composed of Carbon according to diagram 1.1?

    <p>18%</p> Signup and view all the answers

    How are biological molecules classified?

    <p>Carbohydrates, Proteins, Lipids, Nucleic acids</p> Signup and view all the answers

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