Cellular Physiology: Membrane Structure and Architecture Quiz
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Questions and Answers

What is the fundamental structural and functional unit of every living organism?

  • Cells (correct)
  • Tissues
  • Organs
  • Systems
  • Which cellular structure is enclosed by a double-membraned envelope with pores?

  • Nucleus (correct)
  • Centrioles
  • Plasma membrane
  • Golgi complex
  • What is the primary function of ribosomes in a cell?

  • Waste elimination
  • Protein synthesis (correct)
  • Storage of genetic information
  • Energy production
  • Which organelle is involved in the storage and transmission of genetic information in cells?

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

    What is the average size range of a cell, typically observed under a microscope?

    <p>$10$ to $20$ micrometers</p> Signup and view all the answers

    Which part of a cell is responsible for maintaining its shape and structural integrity?

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

    What is the primary function of the plasma membrane?

    <p>Regulating the entry of ions and nutrients</p> Signup and view all the answers

    How does the plasma membrane facilitate communication between the cell and its environment?

    <p>Containing proteins that allow the cell to recognize molecules or changes in its environment</p> Signup and view all the answers

    Which component of the cell relies on membrane proteins to maintain the cell's shape?

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

    What is the chemical composition of membranes primarily made up of?

    <p>Lipids and proteins with no carbohydrates</p> Signup and view all the answers

    Which factor does NOT influence the variation in membrane composition?

    <p>Levels of carbohydrates in the diet</p> Signup and view all the answers

    What is the role of membrane proteins in establishing connections between cells?

    <p>Creating specialized junctions between adjacent cells</p> Signup and view all the answers

    What type of lipids make up the cellular membranes according to the text?

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

    How do the apolar chains of fatty acids in phospholipids orient within the membrane?

    <p>Towards the center of the bilayer</p> Signup and view all the answers

    Where do the polar regions of phospholipids face within the membrane structure?

    <p>Towards the surfaces of the membrane</p> Signup and view all the answers

    Which component of the cellular membrane has an apolar cyclic nucleus with a polar hydroxyl group?

    <p>Cholesteryl esters</p> Signup and view all the answers

    What type of interactions do cholesterol's polar hydroxyl groups form within the membrane?

    <p>Hydrogen bonds</p> Signup and view all the answers

    In a cellular membrane, what role does cholesterol play in relation to phospholipids?

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

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