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Cell Membrane Transport Mechanisms Quiz
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Cell Membrane Transport Mechanisms Quiz

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Questions and Answers

In passive diffusion, how do molecules move?

  • From a region of lower concentration to higher concentration
  • From a region of higher concentration to lower concentration (correct)
  • Against the concentration gradient
  • By active transport across a selectively permeable membrane
  • Which transport mechanism requires a large concentration gradient for adequate nutrient uptake?

  • Gram-positive cell wall transport
  • Active transport (correct)
  • Gram-negative cell wall transport
  • Facilitated diffusion
  • What is a key feature of facilitated diffusion?

  • Movement from lower to higher concentration
  • Requires energy input
  • Uses protein channels or carriers (correct)
  • Movement against the concentration gradient
  • Which type of transport mechanism is crucial for nutrient uptake in microorganisms?

    <p>Active transport</p> Signup and view all the answers

    What differentiates active transport from passive diffusion?

    <p>Utilizes energy and pumps molecules against the gradient</p> Signup and view all the answers

    How do microorganisms primarily take in dissolved particles?

    <p>Diffusion through lipid bilayers</p> Signup and view all the answers

    What is the main difference between macronutrients and trace elements?

    <p>Macronutrients are needed in larger quantities than trace elements.</p> Signup and view all the answers

    Which of the following best describes facilitated diffusion?

    <p>Passive movement of molecules across a membrane down their concentration gradient with the help of channel proteins.</p> Signup and view all the answers

    How do Gram-positive and Gram-negative cell walls differ?

    <p>Gram-positive cell walls have a thick layer of peptidoglycan, while Gram-negative cell walls have a thin layer of peptidoglycan.</p> Signup and view all the answers

    What is the primary function of active transport in bacterial cells?

    <p>To move solutes from an area of low concentration to an area of high concentration using energy.</p> Signup and view all the answers

    What is the structure responsible for providing rigidity to bacterial cell walls?

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

    Which process involves the simultaneous transport and chemical modification of substances as they cross the plasma membrane?

    <p>Group translocation</p> Signup and view all the answers

    What type of transport is characterized as not being energy-dependent?

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

    Which substances can easily cross the plasma membrane via passive diffusion?

    <p>H2O, O2, and CO2</p> Signup and view all the answers

    In what direction does the movement occur in active transport?

    <p>From low to high concentration</p> Signup and view all the answers

    Which cell wall component contributes significantly to protecting bacterial cells from osmotic stress and toxic materials?

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

    Which type of bacteria has a thicker peptidoglycan layer: Gram-positive or Gram-negative?

    <p>Gram-positive</p> Signup and view all the answers

    What type of proteins help facilitate substances passing through the plasma membrane by forming pores?

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

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