Facilitated Diffusion in Biology
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Questions and Answers

What is the source of energy in primary active transport?

  • Carrier proteins
  • Secondary molecular or ionic substances
  • Breakdown of ATP or other high-energy phosphate compounds (correct)
  • Ionic concentration differences
  • What is required for both primary and secondary active transport?

  • Energy from ATP
  • Molecular pumps
  • Carrier proteins (correct)
  • Ionic concentration differences
  • Which of the following is an example of a substance that can be actively transported through cell membranes?

  • Sodium ions (correct)
  • Water
  • Oxygen
  • Nitrogen
  • What is the difference between primary and secondary active transport?

    <p>The type of energy used</p> Signup and view all the answers

    Where do the carrier proteins involved in active transport reside?

    <p>Through the cell membrane</p> Signup and view all the answers

    What is the primary function of the sodium-potassium pump?

    <p>To control the volume of each cell</p> Signup and view all the answers

    What is the concentration of calcium ions in the intracellular cytosol compared to the extracellular fluid?

    <p>10,000 times lower</p> Signup and view all the answers

    How many receptor sites for binding sodium ions are present on the Na+-K pump?

    <p>3</p> Signup and view all the answers

    What is the ATPase activity located on the Na+-K pump?

    <p>Near the sodium binding sites</p> Signup and view all the answers

    What would happen to most cells in the body without the function of the Na+-K pump?

    <p>They would swell until they burst</p> Signup and view all the answers

    How many primary active transport calcium pumps are mentioned in the text?

    <p>2</p> Signup and view all the answers

    What is the function of the carrier protein in the cell membrane?

    <p>To pump calcium ions out of the cell</p> Signup and view all the answers

    In which organelles does the carrier protein pump calcium ions?

    <p>Mitochondria and sarcoplasmic reticulum</p> Signup and view all the answers

    What is the function of the ATPase enzyme in the carrier protein?

    <p>To cleave ATP</p> Signup and view all the answers

    In which part of the body is primary active transport of hydrogen ions important?

    <p>Gastric glands of the stomach and renal tubules</p> Signup and view all the answers

    What is the result of primary active transport of hydrogen ions in the gastric glands?

    <p>Secretion of hydrochloric acid</p> Signup and view all the answers

    What type of cells in the renal tubules are involved in primary active transport of hydrogen ions?

    <p>Intercalated cells</p> Signup and view all the answers

    What is facilitated diffusion also known as?

    <p>Carrier-mediated diffusion</p> Signup and view all the answers

    What happens to the rate of facilitated diffusion as the concentration of the diffusing substance increases?

    <p>It approaches a maximum, called Vmax</p> Signup and view all the answers

    What type of transporter is GLUT1?

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

    What is the direction of movement in active transport?

    <p>Uphill, against the concentration gradient</p> Signup and view all the answers

    What is the key difference between simple diffusion and facilitated diffusion?

    <p>The rate of diffusion approaches a maximum, Vmax</p> Signup and view all the answers

    What is the purpose of a carrier protein in facilitated diffusion?

    <p>To facilitate diffusion of the substance</p> Signup and view all the answers

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