Ch 10 - Cell Cycle and Cell Division11th Biology
Karyokinesis vs. Cytokinesis
What is the fundamental difference between karyokinesis and cytokinesis during the M phase?
What is the fundamental difference between karyokinesis and cytokinesis during the M phase?
- Karyokinesis: The division and separation of the nucleus (daughter chromosomes).
- Cytokinesis: The division of the cytoplasm to physically separate the parent cell into two distinct daughter cells.
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Average Cell Cycle Span
What is the typical duration of the cell cycle for a human cell in culture compared to a yeast cell?
What is the typical duration of the cell cycle for a human cell in culture compared to a yeast cell?
- Human Cell: Approximately 24 hours. (Interphase takes >95% of this time, leaving only about 1 hour for the actual M phase).
- Yeast Cell: Only about 90 minutes.
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Regulation of the Cell Cycle
What are the primary molecular complexes and checkpoints responsible for regulating and halting the cell cycle if errors occur?
What are the primary molecular complexes and checkpoints responsible for regulating and halting the cell cycle if errors occur?
- Cyclins and Cdks: The cell cycle is governed by heterodimeric protein kinases composed of a regulatory subunit (Cyclin) and a catalytic subunit (Cyclin-Dependent Kinase or Cdk).
- G1/S Checkpoint: Monitors cell size, nutrients, and DNA damage before allowing the cell to commit to DNA replication.
- G2/M Checkpoint: Ensures that DNA replication is fully completed and repaired without errors before entering mitosis.
- M Phase Checkpoint: Ensures all chromosomes are properly attached to spindle fibres at the kinetochores before anaphase begins.
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Also in this chapter
30 more cards to study in Prism
- 4The Quiescent Stage (G0 Phase)
- 5S-Phase Dynamics
- 6The Gap Phases (G1 and G2)
- 7Compartmentalized Duplication in S Phase
- 8Mitosis in Diploids vs. Haploids
- 9Prophase Key Events
- 10Metaphase and Kinetochores
- 11Anaphase Splitting
- 12Telophase (Reverse Prophase)
- 13Multinucleate Condition (Syncytium)
- 14Animal vs. Plant Cytokinesis (Directionality)
- 15Origin of the Plant Cell Plate
- 16Significance of Mitosis
- 17The Core Principle of Meiosis
- 18Prophase I Substages
- 19Synapsis and Bivalents (Zygotene)
- 20Visibility of Bivalents (Tetrads)
- 21Recombination in Pachytene
- 22Diplotene, Chiasmata & Dictyotene
- 23Diakinesis
- 24Metaphase I vs. Metaphase II Alignment
- 25Anaphase I vs. Mitotic Anaphase
- 26Dyad vs. Tetrad of Cells
- 27Interkinesis
- 28Meiosis II: The Equational Division
- 29Equal vs. Unequal Meiotic Products
- 30Significance of Meiosis
- 31Synaptonemal Complex & Recombination Nodules
- 32Amitosis in Lower Organisms
- 33Mitosis vs. Meiosis Comparison
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