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BIOL 1020 (281)
Joy Stacey (44)
Lecture 20

BIOL 1020 Lecture 20: Lecture 20

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University of Manitoba
Biological Sciences
BIOL 1020
Joy Stacey

Lecture 20 Cell cycle Binary fission: Origin of replication in bacteria usually consist of single large chromosome (single large loop of DNA) o Two copies of DNA in prokaryotic cell o Half goes to each side of a elongated cell o Cell separates into two identical cells Eukaryotic cell cycle is regulated by a molecular control system The frequency of cell division varies with the type of cell o Mouth and skin cells divide rapidly. o Neurons in our spinal cord and brain do not divide These cell differences result from regulation at the molecular level o All cells minus gametes have the same DNA The cell cycle appears to be driven by specific chemical signals present in the cytoplasm. The sequential events of the cell cycle are directed by a distinct cell cycle control system, which is similar to a clock The cell cycle control system is regulated by both internal and external control The clock has specific checkpoints where the cell cycle stops until a go ahead single is received. o (mitotic checkpoint, G2, and G1 checkpoints cell can stop at any one of these phases if hits a stop) For most cells, G1 checkpoint seems to be the most important one
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