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General Biology: The Cell Cycle

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  • What is the result of most cell division?
    Most cell division results in genetically identical daughter cells.
  • What are the two main phases of the cell cycle?
    The cell cycle alternates between the mitotic phase and interphase.
  • What happens during interphase?
    Interphase is when the cell grows, performs normal functions, and duplicates its DNA in preparation for mitosis.
  • What occurs during the mitotic phase?
    The mitotic phase includes mitosis (nuclear division) and cytokinesis (cytoplasm division), producing two daughter cells.
  • How is the eukaryotic cell cycle regulated?
    The eukaryotic cell cycle is regulated by a molecular control system that ensures proper timing and order of events.
  • Why is regulation of the cell cycle important?
    Regulation prevents errors like uncontrolled division or DNA damage, maintaining genetic stability.
  • What is the role of checkpoints in the cell cycle?
    Checkpoints monitor and verify whether the processes at each phase have been accurately completed before progression.
  • Name the main checkpoints in the cell cycle.
    The main checkpoints are the G1 checkpoint, G2 checkpoint, and metaphase checkpoint.
  • What happens at the G1 checkpoint?
    The G1 checkpoint assesses cell size, nutrients, growth factors, and DNA integrity before DNA synthesis.
  • What is checked at the G2 checkpoint?
    The G2 checkpoint ensures DNA replication is complete and checks for DNA damage before mitosis.
  • What is the metaphase checkpoint's function?
    It ensures all chromosomes are properly attached to the spindle before anaphase begins.
  • What molecules are key regulators of the cell cycle control system?
    Cyclins and cyclin-dependent kinases (CDKs) are key molecules regulating the cell cycle.
  • How do cyclins and CDKs regulate the cell cycle?
    Cyclins bind to CDKs, activating them to phosphorylate target proteins that drive cell cycle progression.
  • What is the significance of cyclin levels fluctuating during the cell cycle?
    Cyclin levels rise and fall to activate CDKs at specific times, ensuring orderly cell cycle transitions.
  • What is mitosis?
    Mitosis is the process of nuclear division that results in two genetically identical nuclei.
  • What are the stages of mitosis?
    The stages are prophase, metaphase, anaphase, and telophase.
  • What happens during prophase?
    Chromosomes condense, the mitotic spindle forms, and the nuclear envelope begins to break down.
  • What occurs in metaphase?
    Chromosomes align at the cell's equator, attached to spindle fibers.
  • Describe anaphase.
    Sister chromatids separate and move toward opposite poles of the cell.
  • What happens during telophase?
    Nuclear envelopes re-form around the two sets of chromosomes, which begin to decondense.
  • What is cytokinesis?
    Cytokinesis is the division of the cytoplasm, resulting in two separate daughter cells.