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General Biology: Eukaryotic Cell Structure and Function

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Termini in questo insieme (20)

  • What is the basic structural and functional unit of living organisms?
    The cell is the basic 'building block' of living organisms.
  • What are organelles in a eukaryotic cell?
    Organelles are membrane-bound bodies with substantial lifetime in the cell, performing specialized functions.
  • What is the role of the nucleus in a eukaryotic cell?
    The nucleus stores DNA and is the site where DNA is transcribed into RNA.
  • What is the nuclear pore complex (NPC)?
    The NPC is composed of ~1,000 proteins, stabilizes an ~800-Å-wide pore, allows passive diffusion of molecules smaller than ~40 kDa, and requires specialized transport for larger macromolecules.
  • What are the main functions of the endoplasmic reticulum (ER)?
    The ER is involved in protein synthesis (secreted and membrane-bound), lipid biosynthesis, and calcium storage.
  • How does the rough ER differ from the smooth ER?
    The rough ER has ribosomes for protein synthesis; the smooth ER is involved in lipid metabolism and lacks ribosomes.
  • What is the primary function of the Golgi apparatus?
    The Golgi apparatus processes and sorts proteins destined for the cell membrane or secretion.
  • What are the main roles of mitochondria?
    Mitochondria generate NADH and ATP and are involved in apoptosis.
  • What is the cytoskeleton composed of?
    The cytoskeleton is composed of microfilaments (actin), intermediate filaments, and microtubules (tubulin).
  • What is the role of microfilaments in the cytoskeleton?
    Microfilaments are composed of actin and provide structural support and enable cell movement.
  • What are intermediate filaments and their function?
    Intermediate filaments provide mechanical strength and help maintain cell shape.
  • What are microtubules and their function?
    Microtubules are dynamic structures made of tubulin that help with intracellular transport and cell division.
  • What is the extracellular matrix (ECM)?
    The ECM is a network of proteins like collagen and fibronectin outside the cell that provides structural support and mediates cell signaling.
  • What is the plant cell wall primarily composed of?
    The plant cell wall is mainly composed of cellulose, providing rigidity and protection.
  • How is genetic information stored and used in the cell?
    DNA in the nucleus stores information; it is transcribed into RNA, which is translated into proteins in the cytosol or on the rough ER.
  • What is the role of ribosomes in the cell?
    Ribosomes synthesize proteins by translating messenger RNA sequences into amino acid chains.
  • What is the function of the nuclear envelope?
    The nuclear envelope encloses the nucleus and contains nuclear pores for regulated transport of molecules.
  • What is the difference between the cis and trans faces of the Golgi apparatus?
    The cis face receives proteins from the ER; the trans face ships processed proteins to their destinations.
  • What is the role of T cells in the immune system?
    T cells coordinate immune responses and can directly attack virus-infected cells.
  • What defines a living entity according to the study materials?
    A living entity is defined by its cellular basis and dynamic biochemical processes.