Passive Transport and Diffusion in Cells
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Passive Transport and Diffusion in Cells

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Questions and Answers

What is the main function of lysosomes in the cell?

  • Store genetic material like DNA
  • Break down macromolecules like proteins and nucleic acids (correct)
  • Maintain an acidic pH environment
  • Generate energy through cellular respiration
  • How are enzymes synthesized and delivered to lysosomes?

  • Delivered directly by Golgi to lysosomes
  • Synthesized in lysosomes, then delivered by vesicles
  • Synthesized in rough ER, sorted in Golgi, then packaged into lysosomes (correct)
  • Packed by Golgi in lysosomes directly
  • What is the role of mitochondria in eukaryotic cells?

  • Break down macromolecules for energy production
  • Generate usable energy through cellular respiration (correct)
  • Store genetic information in circular genomes
  • Maintain an acidic pH environment
  • What makes mitochondria and chloroplasts semi-autonomous organelles?

    <p>They have circular genomes and grow independently of other compartments</p> Signup and view all the answers

    Which organelle is responsible for maintaining an acidic internal environment in the cell?

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

    What is the primary function of contractile vacuoles in the cell?

    <p>Regulate water content and prevent cell swelling</p> Signup and view all the answers

    What is the function of turgor pressure in a cell?

    <p>To resist deformation of the cell wall</p> Signup and view all the answers

    Which organelle contributes to turgor pressure in plant and fungal cells?

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

    What is the role of the cytoskeleton in a cell?

    <p>Maintaining shape and serving as a network of tracks for movement of substances</p> Signup and view all the answers

    What is the main function of a contractile vacuole in a cell?

    <p>Expelling excess water from the cell</p> Signup and view all the answers

    How does the endomembrane system compartmentalize a cell?

    <p>By facilitating communication between organelles through membrane 'bridges'</p> Signup and view all the answers

    What is the primary role of the cytoplasm in a cell?

    <p>To provide a jelly-like environment surrounding organelles</p> Signup and view all the answers

    Which type of transport involves the net movement of substances from areas of higher to lower concentration?

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

    What is the primary source of energy for primary active transport?

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

    What is the main function of aquaporins in cell membranes?

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

    What type of transport utilizes the energy of an electrochemical gradient to drive movement of ions or molecules?

    <p>Secondary active transport</p> Signup and view all the answers

    Which process is responsible for the movement of water across a selectively permeable membrane?

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

    What prevents cells from lysing or bursting due to excessive water intake in protists and single-celled eukaryotes?

    <p>Contractile vacuoles</p> Signup and view all the answers

    Which structure helps maintain the shape and internal composition of cells by being external to the cell membrane?

    <p>Cell wall</p> Signup and view all the answers

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