Cell Membrane Structure and Function
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Questions and Answers

How are the lipids arranged within the cell membrane?

  • Hydrophobic tails towards the inner part
  • Hydrophobic tails towards the outer sides
  • Polar head towards the outer sides (correct)
  • Polar head towards the inner part
  • What major lipids make up the cell membrane?

  • Cholesterol
  • Phospholipids (correct)
  • Phosphoglycerides
  • Saturated hydrocarbons
  • What component ensures that the nonpolar tail of saturated hydrocarbons is protected from the aqueous environment?

  • Carbohydrates
  • Proteins
  • Cholesterol
  • Phospholipids (correct)
  • What additional component besides phospholipids is found in the cell membrane?

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

    What is the approximate percentage composition of proteins in the erythrocyte membrane?

    <p>52%</p> Signup and view all the answers

    How can membrane proteins be classified based on ease of extraction?

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

    Which organelle was instrumental in studying the detailed structure of the cell membrane?

    <p>Electron microscope</p> Signup and view all the answers

    What divides the intracellular space into luminal and extra luminal compartments?

    <p>Endoplasmic reticulum</p> Signup and view all the answers

    Which organelle often shows ribosomes attached to its outer surface?

    <p>Endoplasmic reticulum</p> Signup and view all the answers

    What type of endoplasmic reticulum is frequently observed in cells actively involved in protein synthesis and secretion?

    <p>Rough endoplasmic reticulum (RER)</p> Signup and view all the answers

    Which organelles are NOT considered part of the endomembrane system due to their functions not being coordinated with other components?

    <p>Mitochondria, chloroplast, and peroxisomes</p> Signup and view all the answers

    Which organelle is the major site for synthesis of steroidal hormones?

    <p>Smooth endoplasmic reticulum (SER)</p> Signup and view all the answers

    In what cells is the rough endoplasmic reticulum (RER) frequently observed?

    <p>Cells actively involved in protein synthesis and secretion</p> Signup and view all the answers

    What is the function of smooth endoplasmic reticulum (SER) in animal cells?

    <p>Lipid synthesis</p> Signup and view all the answers

    What distinguishes smooth endoplasmic reticulum (SER) from rough endoplasmic reticulum (RER)?

    <p>Presence of ribosomes on surface</p> Signup and view all the answers

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