BIO130H1 Lecture Notes - Lecture 12: Plant Cell, Telophase, Cleavage Furrow
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BIO130H1 Full Course Notes
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Document Summary
Scientists noticed two things of the cell cycle using the light microscope: not all cells in a culture divide at the same time. Very few cells can be observed in the process of cell division at any given time. Cell division: cell division observed in a lung cell maintained in cell culture. M phase (mitosis, cytokinesis): nucleus and cytoplasm divide. Interphase (g1, 2, g2): period between cell division. G1: cell grows and carries out normal metabolism, organelles duplicate. S: dna replication and chromosome duplication (before mitosis) Cell cycles: multicellular organisms: many mature cells don"t divide: g0 phase. E. g. , nerve cells, muscle cells, rbc (no nucleus) Lose ability to divide as they become specialized. Some cells only divide when given an appropriate stimulus: g0 phase. Some cells normally divide on an ongoing basis: Surgical removal remaining liver cells start to divide to replace the lost tissue. E. g. , hematopoietic (in bone marrow) and epithelial stem cells.
