Membrane Structure and Function Quiz
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Questions and Answers

What is the main function of the plasma membrane?

  • Facilitating cell communication
  • Acting as a site for energy production
  • Separating the internal cytoplasm from the external environment of the cell (correct)
  • Regulating cell size

    • What are the characteristics of the phospholipid bilayer in the plasma membrane?

  • Contains only polar molecules
  • Nonpolar, hydrophobic, fatty-acid tails sandwiched between polar, hydrophilic heads (correct)
  • Consists of a single layer of phospholipids
  • Polar, hydrophilic, fatty-acid tails sandwiched between nonpolar, hydrophobic heads

    • What are the two types of membrane proteins found in the plasma membrane?

  • Receptor and enzyme proteins
  • Peripheral and integral proteins (correct)
  • Transmembrane and cytoplasmic proteins
  • Glycoproteins and lipoproteins

    • Which process involves the movement of substances across the plasma membrane without the input of energy?

    <p>Passive transport</p> Signup and view all the answers

    What is the primary function of integral proteins in the plasma membrane?

    <p>Transporting specific substances across the membrane</p> Signup and view all the answers

    Which of the following best describes the structure of the plasma membrane?

    <p>A phospholipid bilayer with nonpolar, hydrophobic fatty-acid tails sandwiched between polar, hydrophilic heads</p> Signup and view all the answers

    What is the role of integral proteins in the plasma membrane?

    <p>Facilitate the transport of substances across the membrane</p> Signup and view all the answers

    Which statement accurately describes peripheral proteins in the plasma membrane?

    <p>They are found on the inner membrane surface</p> Signup and view all the answers

    What is the primary function of cholesterol in the plasma membrane?

    <p>Regulating the fluidity of the membrane</p> Signup and view all the answers

    How do membrane proteins contribute to cell-cell communication?

    <p>By serving as recognition sites for specific molecules</p> Signup and view all the answers

    What is the main function of the plasma membrane?

    <p>Separating the internal cytoplasm from the external environment of the cell</p> Signup and view all the answers

    What is the composition of the phospholipid bilayer in the plasma membrane?

    <p>Nonpolar, hydrophobic, fatty-acid tails sandwiched between polar, hydrophilic heads</p> Signup and view all the answers

    Where are integral proteins found in the plasma membrane?

    <p>Embedded within the hydrophobic region of the phospholipid bilayer</p> Signup and view all the answers

    What is the role of peripheral proteins in the plasma membrane?

    <p>Found on the inner membrane surface</p> Signup and view all the answers

    What are the two main types of transport across the plasma membrane?

    <p>Passive and active transport</p> Signup and view all the answers

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