BSC 1010C Lecture Notes - Lecture 12: Protein Kinase, Motor Protein, Nuclear Membrane
20 Oct 2016
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Unit iii : chapter 12 ~ mitosis and the cell cycle. * ring chromosome replicates, attaches to plasma membrane. Cell growth separates the copies. (constricting ring of protein pinches the cell in two) Eukaryotes: (1) nuclear division= mitosis (division of the nucleus) Packaged in linear chromosomes (2) partition of cytoplasm = cytokinesis. M phase : mitosis ( chromosomes replicates are separated) seperation. S phase : dna synthesis ( chromosomes replicated) duplication. A chromosome consists of one chromatid (before replication) or two (after replication) * sister chromatids are connected by the centromere. Each daughter cell gets exactly the same chromosomes as the parent cell had. (doesn"t change the number of chromosomes) * spindle microtubules form from pair of centrosomes, which begin migrating to poles: prophase: chromosomes condense, miotic spindle forms. *daughter cells each hav the same number and kind of. Animals: constricting ring of micro laments actin & myosin. Observation: spindle microtubules shorten as attached chromosomes migrate to poles.
