Mitosis & Cell Cycle Cell Cycle: A repetitious event Two Main areas: and Interphase : Cell increases in size, prepares for DNA copying Synthesis: DNA gets (2 copies of DNA) Growth 2: Cell grows more, make more proteins, replicate Mitosis: Cell Mitosis in depth phase of the cell cycle Many things going on in the cell One cell becomes two Virchow “Every cell comes from a pre-existing cell” Four main phases: Prophase, Metaphase, Anaphase, Telophase Prophase phase of mitosis Chromatin coils up into visible chromosomes (sister chromatids) Connected by a centromere Nuclear envelope and nucleolus Centrioles migrate to opposite ends of the cell form between centrioles Metaphase Short second phase of mitosis Spindle fibers attach to centromeres and move chromatid sisters to the of the cell Anaphase Shortening of the spindle fibers pulls chromatid sisters . separate and go to opposite ends of the cell Telophase Final phase of mitosis Chromatids are at (ends) of the cell Spindle fibers break down, new nucleus and nucleolus start to reappear Double membrane begins to form between nuclei Cytokinesis

Which symbols below represent the ions found in the glass of water ? a. oh- and h+ b. co2 and o2 c. o2 and h2 d. nh3- and h+

In 1959, doctors began using the powerful antibiotic methicillin to treat infections of staphylococcus aureus, but within two years, methicillin-resistant strains of s. aureus (mrsa) appeared. how did the resistant strains of s. aureus emerge? in 1959, doctors began using the powerful antibiotic methicillin to treat infections of staphylococcus aureus, but within two years, methicillin-resistant strains of s. aureus (mrsa) appeared. how did the resistant strains of s. aureus emerge? staphylococcus aureus bacteria that were able to synthesize cell walls using a protein that was not affected by methicillin survived the methicillin treatments and reproduced at higher rates than did other individuals. over time, these resistant individuals became increasingly common. in response to treatment of staphylococcus aureus infections with methicillin, some bacteria began to synthesize cell walls using a protein that was not affected by methicillin. these bacteria survived the methicillin treatments and reproduced at higher rates than did other individuals. over time, these resistant individuals became increasingly common. in response to treatment of staphylococcus aureus infections with methicillin, bacterial populations gradually began to synthesize cell walls using a protein that was not affected by methicillin.

Which kingdom includes some organisms that have no nucleus and can live in an environment with an extremely high salt content