Introduction to Lipids
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Questions and Answers

What is the primary functional property of the covalent bond between oxygen and hydrogen in acetic acid?

  • The bond is so nonpolar that hydrogen ions (H+) tend to dissociate reversibly.
  • The bond is so polar that hydrogen ions (H+) tend to dissociate reversibly. (correct)
  • The bond is so polar that hydrogen ions (H+) tend to dissociate irreversibly.
  • The bond is so nonpolar that hydrogen ions (H+) tend to dissociate irreversibly.
  • In cells, where is acetic acid found in its ionic form?

  • In the cytoplasm.
  • In the carboxylate group. (correct)
  • In the nucleus.
  • In the mitochondria.
  • What is the name of the class of compounds that acetic acid belongs to?

  • Carboxylic acids. (correct)
  • Alcohols.
  • Ketones.
  • Alkanes.
  • What property of acetic acid is responsible for the sour taste of vinegar?

    <p>Its high concentration of hydrogen ions.</p> Signup and view all the answers

    What type of reaction is involved in the synthesis of a fat molecule (triacylglycerol) from glycerol and fatty acids?

    <p>Dehydration.</p> Signup and view all the answers

    How can triglycerides be formed from a mix of different fatty acids?

    <p>By adding different fatty acids to the glycerol backbone.</p> Signup and view all the answers

    What is the unifying feature of lipids?

    <p>Having little or no affinity for water</p> Signup and view all the answers

    Which of the following is NOT one of the most biologically important lipids?

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

    What are the components of a triacylglyceride molecule?

    <p>One molecule of glycerol and three molecules of fatty acids</p> Signup and view all the answers

    What is the functional property of alcohol groups (-OH) in biological molecules?

    <p>They are polar and attract water molecules, helping dissolve organic compounds</p> Signup and view all the answers

    Which of the following molecules contains a carboxylic acid group?

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

    Which of the following statements about the solubility of n-alkanes in water is true?

    <p>The solubility of n-alkanes in water decreases with increasing chain length</p> Signup and view all the answers

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