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Lipids Knowledge-Based Practice

Biology · Chemistry of Life · Biology · Biological Macromolecules

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

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Questions

  1. 1.

    Although lipids encompass structurally diverse molecules such as triacylglycerols, phospholipids, and steroids, which common chemical characteristic unites all members of this group?

    • A) The presence of a glycerol backbone linked to three hydrocarbon chains
    • B) The formation of extended polymers composed of identical monomer subunits
    • C) High solubility in aqueous solutions facilitated by multiple charged functional groups
    • D) Hydrophobic behavior resulting from a predominance of nonpolar carbon-hydrogen bonds
  2. 2.

    During the synthesis of a triacylglycerol molecule, which type of covalent bond is formed between the glycerol backbone and each fatty acid?

    • A) Phosphodiester linkage
    • B) Ester linkage
    • C) Glycosidic linkage
    • D) Peptide bond
  3. 3.

    Which of the following structural features distinguishes steroids, such as cholesterol, from other major classes of lipids?

    • A) A glycerol backbone covalently bonded to three fatty acid tails
    • B) A charged phosphate group attached to two long-chain hydrocarbon tails
    • C) A carbon skeleton consisting of four fused rings
    • D) A linear polymer formed by repeating carbohydrate monomers
  4. 4.

    Which of the following structural characteristics distinguishes a phospholipid molecule from a triacylglycerol?

    • A) The presence of a three-carbon glycerol backbone
    • B) The attachment of fatty acids to glycerol through ester linkages
    • C) The complete absence of nonpolar hydrocarbon chains
    • D) The replacement of one fatty acid with a phosphate group linked to a polar head
  5. 5.

    Which of the following best explains why unsaturated fatty acids are typically liquid at room temperature, whereas saturated fatty acids are solid?

    • A) Saturated fatty acids contain multiple carbon-carbon double bonds that stabilize the molecule into a rigid crystalline lattice.
    • B) Unsaturated fatty acids lack a glycerol backbone, reducing their molecular weight and lowering their melting point.
    • C) Saturated fatty acids possess polar hydrocarbon chains that form strong hydrogen bonds with one another at room temperature.
    • D) Unsaturated fatty acids contain one or more carbon-carbon double bonds that introduce kinks into the hydrocarbon chains, preventing tight molecular packing.

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