BLG 151 Chapter Notes - Chapter 7: Water Activity, Sodium Chloride, Acidophile

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7. 1 reproductive strategies (focusing on bacterial and archaeal) Eukary: asexual reproduction (mitosis) and sexual reproduction (meiosis) Most bact and arch are haploid, thfo produce by binary fission. Binary fission: cell elongates as new mat is synthesized, replicates chromo and separates newly formed dna molec so there is one chromo in ea half cell. Septum: cross wall, formed at midcell, dividing parent cell into 2 progeny cells. In all bact reproduction, genome of cell must be replicated and segregated to form distinct nucleoids. Ea nucleoid and surrounding cytoplasm becomes enclosed w/in own plasma membr. Cell cycle: complete seq of event extending from formation of new cell through next division. 2 pathways function during bact cell cycle: one replicates and partitions dna into progeny cell and other carries out cytokinesis: formation of septum and progeny cells. Origin of replication: single site on each circular chromo at which replication starts.

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