Cell Membrane Structure: Lipid Bilayer and Membrane Proteins
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Questions and Answers

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

  • Support and anchor peripheral proteins
  • Catalyze specific chemical reactions
  • Anchor proteins in neighboring cells
  • Recognize and bind specific molecules (correct)
  • Which of the following is a function of peripheral proteins in the plasma membrane?

  • Catalyze specific chemical reactions
  • Anchor integral proteins within the cell (correct)
  • Serve as cellular recognition sites
  • Support the lipid bilayer structure
  • In what way do membrane glycoproteins and glycolipids contribute to cell identity?

  • Catalyze specific chemical reactions
  • Anchor proteins in neighboring cells
  • Enable cells to recognize and respond to foreign cells (correct)
  • Support the lipid bilayer structure
  • What is the fluid portion of cytoplasm called that contains water, dissolved solutes, and suspended particles?

    <p>Cytosol</p> Signup and view all the answers

    Which statement about ABO blood type markers is true?

    <p>They serve as cell identity markers</p> Signup and view all the answers

    What role do integral proteins play as linkers in the plasma membrane?

    <p>Anchor proteins in plasma membranes of neighboring cells</p> Signup and view all the answers

    Which type of membrane protein spans the entire lipid bilayer and protrudes into both the cytosol and extracellular fluid?

    <p>Transmembrane proteins</p> Signup and view all the answers

    What is the main difference between integral and peripheral membrane proteins?

    <p>Integral proteins extend into or through the lipid bilayer and are firmly embedded in it, while peripheral proteins are not as firmly embedded in the membrane.</p> Signup and view all the answers

    What function do some integral proteins serve by forming ion channels, pores, or holes in the membrane?

    <p>Enable specific ions to flow in or out of the cell</p> Signup and view all the answers

    What is a common feature of carriers among integral membrane proteins?

    <p>They selectively move polar substances or ions from one side of the membrane to the other.</p> Signup and view all the answers

    What percentage of membrane lipids consist of cholesterol?

    <p>About 20%</p> Signup and view all the answers

    What is the main function of smooth ER in cells?

    <p>Synthesizing fatty acids and steroids</p> Signup and view all the answers

    How does rough ER differ from smooth ER in terms of protein synthesis?

    <p>Rough ER synthesizes proteins, while smooth ER does not.</p> Signup and view all the answers

    Which organelle is responsible for transporting proteins synthesized by rough ER to different parts of the cell?

    <p>Golgi complex</p> Signup and view all the answers

    What is the primary role of phospholipids in cell membranes?

    <p>Regulate passage of molecules into and out of the cell</p> Signup and view all the answers

    How do glycoproteins contribute to cell function?

    <p>Facilitate cell adhesion</p> Signup and view all the answers

    What distinguishes integral proteins from peripheral proteins in the cell membrane?

    <p>Integral proteins are embedded within the lipid bilayer, while peripheral proteins are only attached to the surface.</p> Signup and view all the answers

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