Lipid Structure and Functions
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Questions and Answers

What is the characteristic of amphipathic molecules?

  • With hydrophilic tails attached to non-polar head groups
  • With hydrophilic tails attached to polar or charged head groups
  • With hydrophobic tails attached to non-polar head groups
  • With hydrophobic tails attached to polar or charged head groups (correct)

    • What is the structural component of sphingolipids?

  • Serine and fatty acid palmitate
  • Cholesterol and serine
  • Sphingosine and fatty acid palmitate (correct)
  • Sphingosine and cholesterol

    • What is the function of ubiquinone in the mitochondrial membrane?

  • It is involved in the synthesis of steroid hormones
  • It is involved in the formation of bilayers
  • It functions in conjunction with enzymes in cellular respiration (correct)
  • It is involved in the regulation of calcium absorption

    • What is the main source of vitamin A?

    <p>Plant pigments such as b-carotene (B)</p> Signup and view all the answers

    What is the result of vitamin D stimulation in the intestine?

    <p>Stimulation of calcium absorption in the intestine (B)</p> Signup and view all the answers

    What is the common characteristic of vitamins A, D, E, and K?

    <p>They are all isoprenoids that perform a variety of physiological roles (C)</p> Signup and view all the answers

    What is the primary function of Vitamin E in the body?

    <p>Suppressing free radical formation (C)</p> Signup and view all the answers

    What is the primary function of Vitamin K in the body?

    <p>Participating in the enzymatic carboxylation of Glu residues (A)</p> Signup and view all the answers

    What is the function of waxes produced by plants?

    <p>Preventing water loss (B)</p> Signup and view all the answers

    Which of the following lipids is known for its 'hot' taste?

    <p>Capsaicin (A)</p> Signup and view all the answers

    Which of the following lipids is used therapeutically as a pain reliever?

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

    What is the common characteristic of Vitamins A, D, E, and K?

    <p>They are all isoprenoids (D)</p> Signup and view all the answers

    What is the main reason for the maintenance of lipid asymmetry in membranes?

    <p>Slow rate of diffusion between leaflets (D)</p> Signup and view all the answers

    What is the characteristic of amino acids found in a transmembrane helix?

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

    What is the term for the movement of lipids within one leaflet?

    <p>Lateral diffusion (A)</p> Signup and view all the answers

    What is the function of translocases or flippases?

    <p>To move lipids between leaflets (B)</p> Signup and view all the answers

    What is the characteristic of longer acyl chains in lipids?

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

    What is the characteristic of saturated acyl chains in lipids?

    <p>Less mobile (A)</p> Signup and view all the answers

    What is the function of bacteriorhodopsin in Halobacteria?

    <p>To capture light energy and move protons across the membrane (B)</p> Signup and view all the answers

    What is the main function of the β-barrel structure in membranes?

    <p>To allow small molecules to diffuse across the membrane (C)</p> Signup and view all the answers

    What is the characteristic of lipid-linked proteins in membranes?

    <p>They are anchored in the lipid bilayer by a covalently attached lipid group (B)</p> Signup and view all the answers

    What is the fluid mosaic model of membrane structure?

    <p>A model of membrane protein diffusion (C)</p> Signup and view all the answers

    What is the role of highly polar residues in integral membrane proteins?

    <p>To mark the point where the polypeptide leaves the membrane (A)</p> Signup and view all the answers

    What can limit the mobility of proteins in the membrane?

    <p>Their interaction with cytoskeletal proteins (A)</p> Signup and view all the answers

    What type of protein moves a single substance at a time?

    <p>Uniporter (A)</p> Signup and view all the answers

    What is the direction of movement of sodium ions through a symport protein?

    <p>Into the cell (B)</p> Signup and view all the answers

    What is the purpose of the Na,K-ATPase pump in the cell?

    <p>To establish a concentration gradient of sodium and potassium ions (D)</p> Signup and view all the answers

    What is the direction of movement of glucose through a uniport protein?

    <p>Out of the cell (A)</p> Signup and view all the answers

    What is the energy source for the transport of Na+ and K+ ions?

    <p>The reaction of converting ATP to ADP + Pi (A)</p> Signup and view all the answers

    What is the result of secondary active transport?

    <p>Transport of molecules against their concentration gradient (C)</p> Signup and view all the answers

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