Chromatin Organization in the Nucleus
31 Questions
1 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What is the function of the mitotic spindle?

  • Controls chromosome movement during mitosis (correct)
  • Forms the centrosomes
  • Produces the asters
  • Replicates the chromosomes

    • Where does the assembly of spindle microtubules begin?

  • Chromosome
  • Centrosome (correct)
  • Kinetochore
  • Nucleus

    • What happens during prometaphase?

  • Sister chromatids separate
  • Spindle microtubules attach to kinetochores (correct)
  • Asters form
  • Chromosomes line up at metaphase plate

    • What occurs in anaphase?

    <p>Sister chromatids separate and move to opposite ends</p> Signup and view all the answers

    What is the role of nonkinetochore microtubules during cell division?

    <p>Overlap and push against each other</p> Signup and view all the answers

    What is cytokinesis?

    <p>Division of cytoplasm into two daughter cells</p> Signup and view all the answers

    What is the major structure associated with the organization of chromatin in the nucleus?

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

    During which phase of mitosis do chromosomes coil up and condense?

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

    What is the importance of mitosis in adult organisms?

    <p>Wound healing and other forms of cell replacement</p> Signup and view all the answers

    Which protein complex holds sister chromatids together during cell division?

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

    What is the initial stage of the cell cycle where chromosomes are extended and uncoiled, forming chromatin?

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

    During which phase of mitosis do centromeres align on the metaphase plate?

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

    What is the main function of cell division in unicellular organisms?

    <p>Reproducing the entire organism</p> Signup and view all the answers

    Which type of cells have half as many chromosomes as somatic cells in eukaryotes?

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

    What is the main characteristic of eukaryotic chromosomes during cell division?

    <p>They consist of chromatin, a complex of DNA and protein.</p> Signup and view all the answers

    What is the narrow 'waist' of the duplicated chromosome where sister chromatids are closely attached?

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

    Which process involves the copying of genetic material to form two identical copies of chromosomes?

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

    In eukaryotic cell division, what process involves the division of the cytoplasm?

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

    'Interphase' in the cell cycle can be divided into different subphases. Which phase involves the copying of chromosomes in preparation for cell division?

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

    'Mitosis' is a key part of eukaryotic cell division. What does it specifically involve?

    <p>Division of the nucleus</p> Signup and view all the answers

    'Chromatin' is a complex associated with eukaryotic chromosomes. What does this complex consist of?

    <p>'Histone and protein'</p> Signup and view all the answers

    'Gametes' are reproductive cells with unique characteristics. How do they differ from somatic cells in terms of chromosome number?

    <p>'Gametes' have half as many chromosomes as somatic cells.</p> Signup and view all the answers

    What is the main regulatory mechanism that monitors the size of the cell and DNA damage before entering the S phase of the cell cycle?

    <p>G1/S checkpoint</p> Signup and view all the answers

    Which of the following regulatory proteins play a key role in driving the cell cycle by activating cyclin-dependent kinases (CDKs)?

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

    What is the process that halves the chromosome number and results in genetic diversity through mixing during gamete formation?

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

    In a diploid organism, chromosomes exist in what kind of pairs?

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

    Which event characterizes Meiosis I, involving the separation of chromosomes that are similar but not identical?

    <p>Separation of homologous chromosomes</p> Signup and view all the answers

    What genetic condition results from the presence of an extra X chromosome in individuals' sex chromosomes?

    <p>Klinefelter's Syndrome</p> Signup and view all the answers

    Which stage of the cell cycle involves the formation of a synaptonemal complex and pairing and disjunction of sister chromatids?

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

    What is the primary function of Meiosis in producing gametes?

    <p>Producing reproductive cells.</p> Signup and view all the answers

    Which phase of meiosis is responsible for the separation of sister chromatids into individual chromosomes?

    <p>Anaphase II.</p> Signup and view all the answers

    More Like This

    Use Quizgecko on...
    Browser
    Open
    Browser
    Browser