Biology 1001A Lecture Notes - Lecture 4: Prokaryote, Mitosis, Metaphase
30 Sep 2012
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Document Summary
When bone marrow is extracted they are basically trying to get at these stem cells which can give rise to all other types of cells. When a stem cell divides it produces a new stem cell and another progeny cell. The progeny cell then divides and differentiates into all the different sorts of mature blood cells that we need. But eukaryotes have lots of replication origins all firing off at once. Many origins and more polymerase makes it replicate faster. The polymerase runs slower than it would in a prokaryotic cell. The top, middle and bottom dna are all chromosomes. When something replicates its dna it does not change the amount of chromosomes it has! We always have 46 chromosomes all of the time! Dna synthesis and replicated chromosomes happens during the s phase. Most cells most of the time are in the g0 stage just doing their job.
