Cell Membrane Structure Quiz
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Questions and Answers

What is the function of the cell membrane?

  • Regulates the passage of molecules in and out of the cytoplasm (correct)
  • Produces energy for the cell
  • Synthesizes proteins and carbohydrates
  • Stores genetic material

    • What is the composition of the cell membrane?

  • Mix of lipids and nucleic acids with embedded proteins
  • Single layer of carbohydrates with embedded lipids
  • Multiple layers of nucleic acids with embedded carbohydrates
  • Two layers of phospholipids with embedded proteins (correct)

    • Why is the plasma membrane considered semi-permeable?

  • It allows certain molecules to pass through while stopping others (correct)
  • It only allows water to pass through
  • It allows all molecules to freely pass through
  • It does not allow any molecules to pass through

    • What type of molecules are not permitted to diffuse through the cell membrane?

    <p>Large, hydrophilic, uncharged molecules and charged molecules</p> Signup and view all the answers

    What type of proteins are dispersed throughout the cell membrane?

    <p>Integral and peripheral proteins</p> Signup and view all the answers

    What is the main role of transport proteins in the cell membrane?

    <p>Facilitate the passage of specific molecules across the membrane</p> Signup and view all the answers

    Which model proposed the idea of unit membrane with three layers: an outer protein layer, a middle lipid layer, and an inner protein layer?

    <p>Trilaminar Model</p> Signup and view all the answers

    Who proposed the Fluid Mosaic Model of the plasma membrane?

    <p>Singer and Nicolson</p> Signup and view all the answers

    What is the main function of the cell wall in a plant cell?

    <p>To provide definite shape and mechanical support to tissues and organs</p> Signup and view all the answers

    Which model is currently accepted for the structure of the plasma membrane?

    <p>Fluid Mosaic Model</p> Signup and view all the answers

    According to the Fluid Mosaic Model, what are the two types of protein molecules present in the plasma membrane?

    <p>Intrinsic proteins and extrinsic proteins</p> Signup and view all the answers

    Who proposed the idea of unit membrane as a trilaminar membrane?

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

    What is the structure of the plasma membrane according to the Fluid Mosaic Model?

    <p>Two layers of lipids and protein with an outer lipid layer and an inner protein layer</p> Signup and view all the answers

    What was proposed by Benson and Korn separately in 1966?

    <p>Hydrophobic binding model</p> Signup and view all the answers

    'Composite model' for the structure of the plasma membrane was proposed by whom?

    <p>(Scheide and Lin, 1970)</p> Signup and view all the answers

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