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Lipids Knowledge-Based Practice

Chemistry · Organic Chemistry · Chemistry · Polymers & Biomolecules

5 Chemistry practice questions on Lipids. Questions that assess core concepts and understanding.

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Questions

  1. 1.

    Which of the following classes of lipids is structurally characterized as an ester composed of a single long-chain fatty acid and a long-chain monohydric alcohol?

    • A) Triacylglycerols
    • B) Glycerophospholipids
    • C) Biological waxes
    • D) Sphingomyelins
  2. 2.

    Which of the following structural features constitutes the fundamental carbon skeleton shared by all steroids?

    • A) An open-chain polyunsaturated hydrocarbon chain linked to a terminal carboxyl group
    • B) A fused tetracyclic ring system consisting of three six-membered rings and one five-membered ring
    • C) A central glycerol molecule linked via ester bonds to three long aliphatic chains
    • D) A long-chain carboxylic acid condensed with a high-molecular-weight monohydric alcohol
  3. 3.

    Which of the following structural features fundamentally distinguishes a glycerophospholipid from a triacylglycerol?

    • A) Glycerophospholipids contain three fatty acid residues linked to a sphingosine core instead of glycerol.
    • B) Glycerophospholipids are non-hydrolyzable lipids characterized by a four-ring steroid nucleus.
    • C) Glycerophospholipids have all three glycerol hydroxyl groups esterified to polar phosphate moieties.
    • D) Glycerophospholipids have one of the glycerol hydroxyl positions esterified to a polar phosphate derivative rather than a third fatty acid.
  4. 4.

    Which of the following statements best explains why naturally occurring unsaturated triacylglycerols generally have lower melting points than saturated triacylglycerols of similar molecular mass?

    • A) Hydrocarbon chains of saturated triacylglycerols form strong intermolecular hydrogen bonds with one another.
    • B) Unsaturated triacylglycerols have significantly lower molar masses that substantially decrease their boiling points.
    • C) Trans double bonds in the unsaturated chains induce linear geometries that disrupt lattice stability.
    • D) Naturally occurring cis double bonds introduce permanent kinks into the acyl chains, preventing tight intermolecular packing.
  5. 5.

    Which of the following sets of products is formed by the complete alkaline hydrolysis (saponification) of one mole of a triglyceride using an excess of aqueous sodium hydroxide?

    • A) One mole of glycerol and one mole of a fatty acid sodium salt
    • B) Three moles of glycerol and three moles of free fatty acids
    • C) One mole of propane-1,3-diol and three moles of fatty acid sodium salts
    • D) One mole of glycerol and three moles of fatty acid sodium salts

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