Simple Diffusion Quiz
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Questions and Answers

Which type of molecules can move across the cell membrane without needing a transport carrier?

  • Respiratory gases and lipid-soluble drugs (correct)
  • Water-soluble drugs and glucose
  • Polar molecules and steroid hormones
  • Large proteins and nucleic acids
  • What is the main characteristic of simple diffusion as a membrane transport mechanism?

  • It relies on specialized transport proteins
  • It is only effective for large molecules
  • It exclusively transports polar molecules
  • It doesn't require energy and doesn't involve ATP utilization (correct)
  • Why can't polar molecules cross the cell membrane through simple diffusion?

  • They are actively transported by carrier proteins
  • They are repelled by the phospholipid heads of the membrane (correct)
  • They are too large to fit through the membrane channels
  • They require ATP for movement
  • Which molecules can dissolve right across the cell membrane through simple diffusion?

    <p>Oxygen, CO2, steroid hormones, and lipid-soluble drugs</p> Signup and view all the answers

    What is the role of specialized transport proteins in simple diffusion?

    <p>They are not involved in simple diffusion</p> Signup and view all the answers

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