Cell Division and Cycle Overview
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Questions and Answers

What is one of the fundamental principles of modern biology?

Cell theory

Which of the following is NOT a major point of cell theory?

  • All organisms are composed of cells or cell products.
  • All cells arise from pre-existing cells.
  • All cells have the same number of chromosomes. (correct)
  • All cells have the same DNA and number of chromosomes.
  • The chemical reactions characteristic of living systems occur within cells.
  • Which of the following is NOT a key role of cell division?

  • Growth and Development
  • Photosynthesis (correct)
  • Reproduction
  • Cell repair and regeneration
  • What is the process by which a single cell becomes two daughter cells called?

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

    During cell division, what two processes are essential for the creation of two new cells?

    <p>Karyokinesis and Cytokinesis</p> Signup and view all the answers

    For successful cell division, the parent cell must be large enough to divide in two while still contributing enough cytoplasmic components to each daughter cell.

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

    Which of the following processes is used by prokaryotes to reproduce?

    <p>Binary fission</p> Signup and view all the answers

    Which of the following is NOT a characteristic of binary fission?

    <p>Produces exact copies of parental chromosomes</p> Signup and view all the answers

    Mitosis occurs in somatic cells and produces exact copies of parental chromosomes.

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

    Meiosis is responsible for making sexual reproduction possible.

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

    During binary fission, two important regions on DNA are involved. What are they?

    <p>Origin of replication and Terminus of replication</p> Signup and view all the answers

    What happens to two origins of replication attached to the plasma membrane during binary fission?

    <p>They move apart.</p> Signup and view all the answers

    What is the process called when the cytoplasm divides during binary fission?

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

    What is the purpose of mitosis in eukaryotic cells?

    <p>To produce two identical daughter cells with the same number of chromosomes as the parent</p> Signup and view all the answers

    The steps involved in mitosis are more complex than binary fission.

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

    What is the term for the time between two successive M phases in the eukaryotic cell cycle?

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

    Which of the following phases is NOT part of Interphase?

    <p>M phase</p> Signup and view all the answers

    The Go phase is a resting phase where cells are not actively dividing.

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

    All body cells actively participate in the cell cycle.

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

    Liver cells can metabolize and detoxify, even when they are in the Go phase.

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

    Nerve cells enter the Go phase permanently after differentiation.

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

    In eukaryotic cells, DNA is organized with histones and other proteins into what structure?

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

    Chromatin can be looped and packaged to form chromosomes.

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

    What is the term used to describe the portrait formed by the number and shapes of chromosomes representative of a species?

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

    What is the typical number of chromosomes in human somatic cells?

    <p>46</p> Signup and view all the answers

    How many chromosomes are there in human gametes?

    <p>23</p> Signup and view all the answers

    What is the term used to describe two chromosomes of the same type?

    <p>Homologous chromosomes</p> Signup and view all the answers

    Homologous chromosomes carry the same set of genes.

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

    One homologous chromosome is referred to as the paternal chromosome, while the other is the maternal chromosome.

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

    What is the term used to describe the duplicated copies of a single chromosome held together after DNA replication?

    <p>Sister chromatids</p> Signup and view all the answers

    During which phase of the cell cycle does DNA duplication occur?

    <p>S phase</p> Signup and view all the answers

    What is the structure called where sister chromatids are held together?

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

    To count the number of chromosomes, count the centromeres.

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

    Which of the following is NOT a stage of mitosis?

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

    What are mitotic spindles made of?

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

    What is the significance of the centrosome during prophase?

    <p>It helps to organize microtubules and migrate to opposite poles.</p> Signup and view all the answers

    Sister chromatids are joined together by cohesins.

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

    During prometaphase, the nuclear membrane breaks down.

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

    What specialized structures on chromosomes do spindle fibers attach to?

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

    Microtubules polymerize and depolymerize during mitosis.

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

    What are kinetochores composed of?

    <p>Protein complexes</p> Signup and view all the answers

    Each kinetochore is associated with one of the sister chromatids.

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

    Kinetochores act as the attachment site for a single spindle microtubule.

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

    What happens to chromosomes during metaphase?

    <p>They align at the metaphase plate.</p> Signup and view all the answers

    During anaphase, sister chromatids separate.

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

    Anaphase is characterized by cleavage of cohesin proteins.

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

    Equal segregation of chromosomes is achieved during anaphase.

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

    During telophase, the nuclear envelope re-forms, and chromosomes decondense.

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

    What is the process called that divides the cytoplasm during cell division in animals?

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

    Cytokinesis is characterized by the formation of a cleavage furrow in animal cells.

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

    What is the cell plate, and what role does it play during cytokinesis in plant cells?

    <p>The cell plate is a new cell wall that forms during cytokinesis in plant cells. It eventually fuses with the existing cell walls, separating the two daughter cells.</p> Signup and view all the answers

    The result of mitosis and cytokinesis is two diploid cells, genetically identical to the parent cell.

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

    Study Notes

    Cell Division and Cell Cycle (Part 1)

    • Cell theory is a fundamental principle of modern biology
    • Four main points in cell theory:
      • All organisms are made of cells or cell products.
      • All cells in an organism have the same DNA and chromosome number, unless they are sex cells.
      • Chemical reactions of living systems happen inside cells.
      • All cells come from pre-existing cells.

    Overview of Cell Division

    • Cells reproduce through cell division
    • Key roles of cell division:
      • Reproduction (unicellular organisms)
      • Growth/development (multicellular organisms)
      • Cell repair/regeneration (multicellular organisms)

    Overview of Cell Division - Processes

    • Cell division is the process where one cell becomes two daughter cells.
    • Cell division includes the division of the nucleus and cytoplasm
      • Karyokinesis: nucleus division
      • Cytokinesis: cytoplasm division, via cleavage furrow
    • Requirements for successful cell division:
      • Full DNA complement distributed to daughter cells from the parent cell.
      • Parent cell must be large enough to divide and still contribute cytoplasmic components to each daughter cell.

    Methods of Cell Division

    • Prokaryotes (example: bacteria and single-celled organisms):
      • Binary fission: asexual reproduction
      • New copy may be identical or have mutations
    • Eukaryotes (example: somatic cells):
      • Mitosis (exact copies of parental chromosomes)
      • Meiosis (makes sexual reproduction possible. Daughter cells have half the number of chromosomes compared to parent cell; Not exact copies)

    Prokaryotic Cell Division (Binary Fission)

    • Most bacteria have one circular chromosome.
    • DNA Replication:
      • Cell increases in size
      • Two important regions on DNA: origin of replication and terminus of replication
    • DNA Segregation:
      • Two origins attached to plasma membrane move apart
      • Cytokinesis: pinching of the plasma membrane; new cell wall material synthesis

    Eukaryotic Cell Division (Mitosis)

    • Result: two identical daughter cells with the same number of chromosomes as the parent cell.
    • Still involves general steps as seen in binary fission, but more complex than in prokaryotes.
    • Reason for complexity: Eukaryotes have a nucleus and more complex DNA.

    Eukaryotic Cell Cycle

    • Cell division proceeds through a number of steps that make up the cell cycle.
    • Two distinct stages:
      • M phase: period of cell division. Parent cell divides into two daughter cells
      • Interphase: time between two successive M phases
        • Stages of interphase: G₁, S, and G₂ (G₁ – cell growth, S – DNA synthesis, G₂ – preparation for mitosis)
    • Go phase: cells not actively dividing

    Eukaryotic Cell Division (Mitosis)- Chromosome Structure

    • In eukaryotes, DNA is organized with histones and other proteins into chromatin
    • Chromatin can be looped and packaged to form chromosomes

    Mitotic Cell Division (Eukaryotes) - Karyotype

    • Karyotype: A visual representation of the chromosome complement of a cell, showing the number, size, and shape of chromosomes
    • Humans:
      • Somatic cells: 46 chromosomes (22 pairs of homologous chromosomes and 2 sex chromosomes)
      • Gametes (sperm or egg): 23 chromosomes

    Mitotic Cell Division (Eukaryotes) - Homologous Chromosomes

    • Two chromosomes of the same type
    • Have genes for same traits
    • One homologue is paternal and other maternal.

    Mitotic Cell Division (Eukaryotes) - Homologous Chromosomes and Sister Chromatids

    • For cell division to occur, each chromosome must be duplicated for each daughter cell to receive full chromosomes.
    • Duplication occurs during the S phase of the cell cycle (synthesis).
    • After DNA duplication, each chromosome consists of two sister chromatids, held together by cohesins at the centromere.

    Exploring Mitosis (Stages)

    • Prophase: Condensation of chromosomes; centrosomes migrate to opposite poles; mitotic spindle formation; nuclear envelope begins to disappear
    • Prometaphase: Nuclear envelope breaks down completely; spindle fibers attach to kinetochores of chromosomes
    • Metaphase: Chromosomes align at the metaphase plate (center of the cell); Spindle fibers fully attached to kinetochores
    • Anaphase: Sister chromatids separate (at the centromere), each becoming a chromosome and move to opposite poles
    • Telophase: Chromosomes reach opposite poles; nuclear envelopes reform; chromosomes decondense; two separate nuclei form
    • Cytokinesis: Cytoplasm divides; two separate diploid daughter cells result.
      • Animal cells: contractile ring
      • Plant cells: cell plate formation

    Test Your Understanding

    • Questions about chromosome replication, cell cycle stage, and cell type

    Next Time:

    • Topics for future lectures: Control of the cell cycle, Meiosis

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    Description

    Explore the fundamental principles of cell division and the cell cycle in this quiz. Understand key processes such as karyokinesis and cytokinesis, along with the significance of cell theory. Ideal for students studying biology, this quiz delves into how cells reproduce, grow, and repair themselves.

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