Cell Membrane Structure and Functions Quiz
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Questions and Answers

What is the arrangement of the phospholipid bilayer in the plasma membrane like?

  • A sandwich with hydrophilic heads aligned on the outer surfaces and hydrophobic tails forming a central layer (correct)
  • An alternating pattern of hydrophilic and hydrophobic layers
  • A single layer with both hydrophilic and hydrophobic properties
  • A random mix of hydrophilic and hydrophobic layers

    • What is the structure of the plasma membrane primarily composed of?

  • Multiple layers of cholesterol and phospholipids
  • A single layer of phospholipids with embedded proteins and sugars
  • A layer of cholesterol with embedded proteins and sugars
  • Two layers of phospholipids with embedded proteins and sugars (correct)

    • What role do some membrane proteins play in terms of cell identity?

  • Act as enzymes for various cellular processes
  • Provide channels for passage of substances across the membrane
  • Act as receptors for hormones and other chemical messengers (correct)
  • Attach to the outside of the cell, giving it immunological identity

    • What is the main difference between hydrophilic and hydrophobic parts of phospholipid molecules?

    <p>The head is electrically charged and water-loving, while the tail has no charge and is water-hating.</p> Signup and view all the answers

    What is the function of cholesterol in the plasma membrane?

    <p>Present alongside phospholipids in the membrane structure</p> Signup and view all the answers

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