Chemistry and Functions of Lipids
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Questions and Answers

Which of the following is a common property of lipids?

  • Insolubility in both water and nonpolar solvents (correct)
  • Solubility in polar solvents
  • Insolubility in nonpolar solvents
  • Solubility in water
  • What is the main function of lipids as thermal insulators?

  • Conducting heat away from the body
  • Trapping air to maintain body temperature (correct)
  • Acting as heat conductors
  • Facilitating perspiration to regulate body temperature
  • Which of the following is NOT a function of lipids?

  • Provide shape and contour to the body
  • Supply essential fatty acids
  • Serve as structural components of biomembranes
  • Facilitate rapid energy release in the body (correct)
  • What do combinations of lipid and protein (lipoproteins) mainly serve as in the body?

    <p>Transporters of lipids in the blood (B)</p> Signup and view all the answers

    Which of the following diseases is associated with abnormal chemistry or metabolism of lipids?

    <p>Obesity (C)</p> Signup and view all the answers

    Which of the following is an example of a compound lipid?

    <p>Phospholipids (D)</p> Signup and view all the answers

    What is the general formula for saturated fatty acids?

    <p>CnH2n+1COOH (C)</p> Signup and view all the answers

    Which type of fatty acids contain no double bonds?

    <p>Saturated fatty acids (B)</p> Signup and view all the answers

    What is the main characteristic of small chain fatty acids?

    <p>2-4 carbons (C)</p> Signup and view all the answers

    Which lipid molecule is derived from simple/compound lipids on their hydrolysis?

    <p>Bile acids (D)</p> Signup and view all the answers

    Flashcards

    What is a common property of lipids?

    Lipids are generally not soluble in water or nonpolar solvents.

    How do lipids function as thermal insulators?

    Lipids act as thermal insulators by trapping air, which helps regulate body temperature. They also provide cushioning protection for organs.

    Which of the following is NOT a function of lipids?

    Lipids are essential for storing energy, but they are not the primary source of rapid energy release. That role is fulfilled by carbohydrates.

    What is the main function of lipoproteins in the body?

    Lipoproteins, a combination of lipids and proteins, are crucial for transporting fats and cholesterol throughout the bloodstream.

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    Which disease is associated with abnormal lipid metabolism?

    Obesity is a condition characterized by excessive body fat, often linked to imbalances in lipid metabolism.

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    What is an example of a compound lipid?

    Phospholipids are a type of compound lipid that contain a phosphate group in their structure, crucial for forming cell membranes.

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    What is the general formula for saturated fatty acids?

    Saturated fatty acids have the general formula CnH2n+1COOH, meaning they contain only single bonds between carbon atoms.

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    Which type of fatty acids have no double bonds?

    Saturated fatty acids lack double bonds in their carbon chain, making them more stable and solid at room temperature.

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    What is a characteristic of small chain fatty acids?

    Small chain fatty acids consist of 2-4 carbon atoms, making them readily absorbed by the body. They are found in dairy products and contribute to the flavour and texture of foods.

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    Which lipid molecules come from the hydrolysis of simple/compound lipids?

    Bile acids are derived from the breakdown of simple or compound lipids during digestion. They help emulsify fats, making them easier to digest and absorb.

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    Study Notes

    Common Properties of Lipids

    • Lipids are hydrophobic or amphipathic, meaning they repel water or can have both hydrophilic and hydrophobic parts.
    • They are generally insoluble in water but soluble in organic solvents.

    Main Function as Thermal Insulators

    • Lipids provide insulation by trapping heat, helping to maintain body temperature in cold environments.
    • They reduce heat loss through the skin by acting as a barrier.

    Functions NOT Associated with Lipids

    • Structural support is primarily a function of proteins, while lipids are mainly involved in energy storage, insulation, and signaling.

    Role of Lipoproteins

    • Lipoproteins are complexes of lipids and proteins that transport lipids through the bloodstream.
    • They play a critical role in lipid metabolism and distribution throughout the body.

    Diseases Linked to Lipid Metabolism

    • Disorders such as hyperlipidemia or atherosclerosis are linked to abnormal lipid chemistry and metabolism.
    • These conditions can lead to cardiovascular diseases due to high levels of lipids in the blood.

    Example of a Compound Lipid

    • Phospholipids are a common example of compound lipids, contributing to cell membrane structure and function.

    General Formula for Saturated Fatty Acids

    • Saturated fatty acids typically follow the formula CnH(2n+1)COOH, where n is the number of carbon atoms.

    Fatty Acids with No Double Bonds

    • Saturated fatty acids contain no double bonds between carbon atoms, resulting in a fully saturated structure with hydrogen.

    Characteristic of Small Chain Fatty Acids

    • Small chain fatty acids (typically fewer than six carbon atoms) are more soluble in water due to their shorter hydrocarbon chain.

    Lipid Molecules from Hydrolysis

    • Glycerol can be derived from the hydrolysis of simple and compound lipids.

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    Description

    Learn about the diverse compounds that make up lipids, such as fats, oils, steroids, and waxes. Understand their physical and chemical properties, as well as their functions as a storage form of energy and their role in cell membranes.

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