Bio 1A03 Test 3 Questions and Answers 100% Pass

Bio 1A03 Test 3 Questions and Answers 100% Pass Binary Fission steps -Initiated when proteins attach DNA to plasma membrane -Begins along ORI region -Newly synthesized DNA also anchored to membrane -Cell elongates until ~2 times its original size and two has two chromosomes on opposite ends of the cell -Cell splits in two Quiescent stem cells, function Permanently arrested in G0 phase. In adults: can replace non-reproducing specialized cells) ex adult skeletal muscle/myofiber) Steps of quiescent stem cell to myofiber -Activated (reenter cell cycle) -Proliferative (look over this one) -Commitment to differentiation -Fusion into myotube (precursor of myofiber) -Myofiber steps of cell cycle G1 phase S phase G2 phase M phase ~G0 phase~ perhaps G1 phase growth phase, prepares cell for dna synthesis s phase cell undergoes dna replication g2 phase growth phase, cell prepares for division M phase mitosis and cytokinesis cells in permanent g0 phase eye lens, nerve, mature muscle cells binary fission is common to bacteria, archaea, mitochondria, chloroplasts Satellite Stem Cells quiescent stem cells that specifically are activated to replace injured muscle fibers Walter Flemming Discovered stages of mitosis from salamanders During interphase, the genetic material of a typical eukaryotic cell is chromatin fiber genetic material during s phase sister chromatids are synthesized (including centromere) but chromosomes don't actually compact until M phase (46 X-shaped not linear chromosomes / 92 chromatids) chromatids chromosome in duplicated state # chromosomes and chromatids in human before & after mitosis, meiosis I, and meiosis II Mitosis Before: 46, 92 After: 46, 46 Meiosis I Before: 46, 92, After: 23, 46 Meiosis II Before: 23, 46 After: 23, 23