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BIO152H5 (270)
Maria Arts (237)
Lecture

bio152 lec 5.docx

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Department
Biology
Course
BIO152H5
Professor
Maria Arts
Semester
Fall

Description
Prokaryotes Bacteria and Archaea No membrane enclosed nucleus No cytoplasmic organellesCell DivisionUnicellular organisms reproduction Multicellular organisms growthmaintenance of tissues repairreproduction Prokaryotes have a simple cell cycleDNA is a single chromosomeDNA replicationcell elongates splits into 2 daughter cellsdivision by binary fission Organisms splits int o2 and ech part becomes a complete organism clone genetically identical daughter cells Chromosome replicates chromosome pull apart ring of FtsZ protein forms FtsZ ring contstricts membranecell wall infold fission is completeReproduction may stop under adverse nutritional conditions require nutrients or go dormantMetabolic activities depend on environmentspeed up ex E coli add carbs takes half time Eukaryotes have a complex cell cycle Eukaryotic cells contain genetic material in the nucleus of cellsEukaryotic DNA i Chromosomes gene carrying structures consisting of a long molecule of DNAassociated proteins histones
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