Microscopy
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Questions and Answers

Which type of microscope uses electrons to visualize objects?

  • C - Scanning Electron Microscopy
  • A - Light Microscopy
  • B - Transmission Electron Microscopy (correct)
  • D - Fluorescence Microscopy

    • What is the purpose of an extracellular layer in cells?

  • To allow adjacent cells to communicate
  • To visualize dead biological specimens
  • To strengthen cells and bind them together (correct)
  • To distinguish two separate points

    • What is the definition of resolution in microscopy?

  • The ability to distinguish two separate points
  • The ability to look at very small objects
  • The measurement of image sharpness (correct)
  • The ability to visualize living specimens

    • Which type of microscope has higher resolution?

    <p>B - Transmission Electron Microscopy</p> Signup and view all the answers

    What happens to the image when a microscope has low resolution?

    <p>The image becomes blurry</p> Signup and view all the answers

    What is the main difference between Light Microscopy and Electron Microscopy?

    <p>The cost</p> Signup and view all the answers

    What is the purpose of cell-cell connections?

    <p>To allow adjacent cells to communicate</p> Signup and view all the answers

    What is the function of the extracellular layer in cells?

    <p>To strengthen cells and bind them together</p> Signup and view all the answers

    What is the purpose of resolving power in microscopy?

    <p>To distinguish two separate points</p> Signup and view all the answers

    What is the definition of resolution in microscopy?

    <p>The measurement of image sharpness</p> Signup and view all the answers

    Which of the following is NOT a function of the extracellular matrix (ECM)?

    <p>Metastasis of cancerous cells</p> Signup and view all the answers

    What is the main protein fiber found in the extracellular matrix (ECM)?

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

    What is the function of tight junctions between animal cells?

    <p>To form a watertight seal between cells</p> Signup and view all the answers

    Which type of cell junction is common in epithelial and muscle tissue?

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

    In plant cells, how are adjacent cells connected?

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

    Which of the following is NOT a type of cell adhesion protein?

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

    What is the main function of gap junctions between animal cells?

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

    What is the main function of desmosomes between animal cells?

    <p>Structural support</p> Signup and view all the answers

    Which of the following is a correct statement about cell-cell attachments in eukaryotic cells?

    <p>Cadherins bind adjacent cells together in desmosomes</p> Signup and view all the answers

    Which of the following is NOT a function of the extracellular matrix (ECM)?

    <p>Metastasis of cancerous cells</p> Signup and view all the answers

    Study Notes

    Microscopy

    • Electron microscopes use electrons to visualize objects, providing higher resolution than light microscopes.
    • Resolution in microscopy refers to the minimum distance between two points that can still be distinguished as separate.
    • Electron microscopes have higher resolution than light microscopes due to the shorter wavelength of electrons compared to light.
    • Low resolution in a microscope results in a blurry or indistinct image.
    • The main difference between Light Microscopy and Electron Microscopy is the type of illumination used: light vs. electrons.

    Cell-Cell Connections and Extracellular Matrix

    • The extracellular layer in cells serves as a supporting structure, regulates the movement of molecules, and provides mechanical strength.
    • The purpose of cell-cell connections is to facilitate communication and adhesion between adjacent cells.
    • The main protein fiber found in the extracellular matrix (ECM) is collagen.
    • Tight junctions between animal cells function to prevent the leakage of molecules between cells.
    • Gap junctions between animal cells allow for the direct exchange of molecules between cells.
    • Desmosomes between animal cells function to hold cells together and provide mechanical strength.
    • In plant cells, adjacent cells are connected through plasmodesmata.
    • Adherens junctions are common in epithelial and muscle tissue.

    Functions of Extracellular Matrix

    • The extracellular matrix (ECM) provides structural support, regulates cell behavior, and serves as a reservoir for signaling molecules.
    • The ECM does not function as a hormone-producing organ.

    Note: Some questions had duplicate or similar information, so I've condensed the notes to focus on the key facts and concepts.

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