Exocytosis vs. Endocytosis Quiz
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Questions and Answers

What is the term for the phase when water moves from the environment to the cytoplasm and to the contractile vacuole?

  • Osmoregulation
  • Diastole (correct)
  • Exocytosis
  • Systole
  • Which organelle is involved in excretion and osmoregulation in Paramecium caudatum?

  • Mitochondria
  • Contractile vacuole (correct)
  • Nucleus
  • Endoplasmic reticulum
  • What does systole refer to in relation to the contractile vacuole?

  • Water moves out of the vacuole (correct)
  • Osmotic pressure increases in the vacuole
  • Water moves into the vacuole
  • Nutrients are stored in the vacuole
  • In the context of water expulsion, what is the function of exocytosis?

    <p>Expulsion of substances from the cell</p> Signup and view all the answers

    Which term specifically relates to the regulation of water balance in a cell?

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

    What does the contractile vacuole do in regards to excess water in Euglenas?

    <p>Contracts to expel excess water</p> Signup and view all the answers

    What is the primary function of excretion in organisms?

    <p>Eliminating waste products of osmoregulatory processes</p> Signup and view all the answers

    Which of the following substances is an example of a nitrogenous waste?

    <p>Uric acid</p> Signup and view all the answers

    What happens to the nitrogen-containing amino group during catabolism?

    <p>It is removed by enzymes and converted to ammonia</p> Signup and view all the answers

    Which process is responsible for removing water and nitrogenous wastes from organisms?

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

    Where are nitrogenous wastes like ammonia, urea, and uric acid primarily removed from in animals?

    <p>By excretory organs</p> Signup and view all the answers

    Which process do some aquatic organisms use to excrete highly toxic ammonia before it reaches dangerous concentrations?

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

    What is the primary function of a contractile vacuole?

    <p>Excreting toxic wastes</p> Signup and view all the answers

    How does a contractile vacuole help organisms in hypertonic environments?

    <p>By adjusting the cytoplasm to be more hypertonic than the outside environment</p> Signup and view all the answers

    What process do amoebas utilize to expel toxic wastes and excess water?

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

    What does exocytosis involve?

    <p>Releasing substances from a cell through fusion with the cell membrane</p> Signup and view all the answers

    In paramecium, what happens when the canals around the contractile vacuole fill with water?

    <p>The vacuole expels the water through a pore in the cytoplasm</p> Signup and view all the answers

    How does exocytosis differ from endocytosis?

    <p>Exocytosis expels substances out, while endocytosis brings substances in.</p> Signup and view all the answers

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