Cell Membrane and Cell Communication Quiz
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Questions and Answers

Which structure acts as a hydrophobic barrier to keep hydrophilic molecules out of the cell?

  • Cholesterol
  • Integral proteins
  • Peripheral proteins
  • Phospholipid bilayer (correct)

    • What is the main function of glycolipids and glycoproteins in the cell membrane?

  • Transport of ions
  • Enzymatic activity
  • Cell-cell recognition (correct)
  • Signal transduction

    • Which transport mechanism requires energy (ATP) and moves substances against their concentration gradient?

  • Facilitated diffusion
  • Osmosis
  • Receptor-mediated endocytosis
  • Active transport (correct)

    • What is the process by which cells take in macromolecules and form new vesicles?

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

    In cell signaling, which step involves the activation of a cellular response after the reception and transduction of a signal?

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

    What is the approximate composition of proteins and lipids in the plasma membrane of human red blood cells?

    <p>60% protein, 40% lipid (55% phospholipid, 25% cholesterol, 18% glycolipid, 2% fatty acid)</p> Signup and view all the answers

    Which model of the plasma membrane proposed the 'Sandwich model' in 1935?

    <p>Davson/Danielli</p> Signup and view all the answers

    What does the term 'selectively permeable' refer to in the context of the plasma membrane?

    <p>Allows some substances to cross more easily than others</p> Signup and view all the answers

    What does the term 'Fluid Mosaic Model' indicate about the structure of the plasma membrane?

    <p>Membrane is held together by weak interactions</p> Signup and view all the answers

    Which method revealed the structure of the membrane's interior by using freeze-fracture technique?

    <p>Freeze-fracture method</p> Signup and view all the answers

    What is the approximate composition of cholesterol in the plasma membrane of human red blood cells?

    <p>18%</p> Signup and view all the answers

    What does the freeze-fracture method reveal about the structure of the membrane's interior?

    <p>The arrangement of phospholipids</p> Signup and view all the answers

    What is the main function of glycolipids and glycoproteins in the cell membrane?

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

    What does the term 'Fluid Mosaic Model' indicate about the structure of the plasma membrane?

    <p>The components are constantly moving and changing positions</p> Signup and view all the answers

    Which type of protein aids in the movement of glucose through human red blood cells?

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

    In which type of transport does water move from an area of higher water potential to lower water potential?

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

    What is the main function of glycolipids and glycoproteins in the cell membrane?

    <p>Cell-cell recognition</p> Signup and view all the answers

    What type of endocytosis involves the intake of fluids by the cell?

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

    Which process involves the expulsion of vesicle contents by fusing with the cell membrane?

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

    What type of proteins aid in the attachment of the cell membrane to the cytoskeleton and extracellular matrix (ECM)?

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

    Which molecule is involved in direct active transport and moves substances against their concentration gradient?

    <p>$Na^+$</p> Signup and view all the answers

    What is the primary function of aquaporins in the cell membrane?

    <p>$H_2O$ transport</p> Signup and view all the answers

    Which molecule is known for its involvement in receptor-mediated endocytosis?

    <p>$LDL$ cholesterol</p> Signup and view all the answers

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

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

    Which type of transport involves the movement of ions through channel proteins or carrier proteins?

    <p>Facilitated diffusion</p> Signup and view all the answers

    What is the primary function of peripheral proteins in the cell membrane?

    <p>Attachment to the cytoskeleton &amp; extracellular matrix (ECM)</p> Signup and view all the answers

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