Biology 1001A Lecture Notes - Lecture 3: Microtubule, Dna Replication, Eukaryote

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Prokaryote division: replication of single circular chromosome partitioning into two daughter cells by binary. Purpose of cell cycling: animal cells- cells divide where there is wear/tear, plants: tip of the roots/branches, meristematic tissues. *most cells are not actively cycling (they serve functions as a cell) *some cells serve purpose as to die (apoptosis): xylem cells (in plants, xylem cells die so water can pass through. Webbed feet/hands: tissues that are surplus are programmed to die) (cid:862)checkpoi(cid:374)ts(cid:863) regulate progressio(cid:374) through the cell cycle. Cell cycle is controlled by cell checkpoint. G0: most cells are here (not dividing, doing its function) G1/s: prevents cells from replicating it dna if the dna is damaged. Anaphase: making sure all chromosomes are attached to the spindle fibre. Cells are most active/organized into their own chromosomes. Blue blob: if you stain individual chromosomes, all the green chromosomes are packed together. Condenses and becomes visible as fibres, and then as chromosomes.

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