MCAT Practice Questions on Triacylglycerols
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Questions and Answers

Why are triacylglycerols used in the human body for energy storage?

  • They always have short fatty acid chains, for easy access by metabolic enzymes.
  • They are highly hydrated, and therefore can store lots of energy.
  • The carbon atoms of the fatty acid chains are highly reduced, and therefore yield more energy upon oxidation. (correct)
  • Polysaccharides, which would actually be a better energy storage form, would dissolve in the body.

    • Which of the following is a way to increase resistance in a wire?

  • Lower the temperature
  • Lengthen the wire (correct)
  • Widen the wire
  • Change from tungsten to copper wire

    • Sexually reproducing species have a selective advantage over asexually reproducing species, because sexual reproduction:

  • Creates novel genetic recombinations. (correct)
  • Is more energy efficient.
  • Decreases the likelihood of mutations.
  • Always decreases offspring survival rate.

    • Which of the following would you expect to find in a microscopic sample of pus?

    <p>Granulocytes, monocytes, and macrophages</p> Signup and view all the answers

    Which of the following is true about cholesterol?

    <p>Cholesterol is a steroid precursor.</p> Signup and view all the answers

    What is true regarding the probability that the sister of an affected man will have osteogenesis imperfecta, if their mother was unaffected?

    <p>The probability depends on the genotype of the father, which cannot be determined from the given information.</p> Signup and view all the answers

    Study Notes

    Triacylglycerols and Energy Storage

    • Triacylglycerols are not highly hydrated, enhancing energy density.
    • Fatty acid chains yield more energy upon oxidation due to high reduction.
    • They vary in length and saturation, affecting energy release.

    Resistance in Electrical Wires

    • Resistance increases with wire length and decreases with cross-sectional area.
    • Longer wires increase resistance; wider wires decrease resistance.
    • Lowering temperature reduces resistivity, leading to better conductivity.

    Sexual Reproduction Advantages

    • Sexual reproduction results in genetic recombination, fostering diversity.
    • Each fertilization combines unique genetic material from two parents.
    • This enhances phenotypic variability in populations.

    Composition of Pus

    • Pus primarily contains phagocytosed bacterial remnants.
    • Microscopic samples of pus reveal granulocytes, monocytes, and macrophages.
    • Neutrophils are critical in the non-specific immune response to pathogens.

    Cholesterol Functionality

    • Cholesterol serves as a precursor for steroid hormones.
    • It can both increase and decrease membrane fluidity depending on temperature.
    • Cholesterol interacts with both hydrophobic and hydrophilic components of phospholipids.

    Osteogenesis Imperfecta and Genetic Probability

    • Osteogenesis imperfecta is an autosomal dominant condition.
    • The probability of an affected man’s sister having the disease relies on the father's genotype.
    • The mother's genotype does not influence the sister's risk since she is unaffected.

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    Description

    Test your knowledge of triacylglycerols and their role in energy storage in the human body. This quiz features multiple-choice questions that challenge your understanding of lipid metabolism and energy yield. Ideal for MCAT preparation and review.

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