2.3+Cell+Cycle

= 2.3 Cell Cycle =

Binary fision- The simple cell division in which a cell splits into two ; used by bacteria.
Cell Cycle- The life of a cell; in eukaryotes it consists of chromosome duplication, mitosis and cytokinesis Centromere- The region that holds cromatids together when a chromosome is duplicated. Chromatids- Identical chromosome copies. Chromosomes- A coiled structure of DNA and protein that forms in the cell nucleus during cell division. Homologous- Chromosomes with matching information. Mitosis- Nuclear division in eukaryotic cells in which each cell receives a copy of the original chromosomes. Bacteria cells reproducinging by spliting in two. This shows binary fission of a bacteria.

Chapter Summary: In this chapter we read of how cells create more of themselves (Reproduction). We viewed pictures of prokaryotic cells (Bacteria) reproducing and we read about eukaryotic cells and how they reproduced also. We were also shown the stages of mitosis. Mitosis begins as when the chromosomes and other materials of a cell are copied. Two cylindrical structures called centrioles are also copied. Now the chromosomes consist of two chromatids. In stage one of mitosis the nuclear membrane will break apart and the chromosomes will condense into a rod looking shape. The two centrioles will then move to the opposite parts of the cell. Between the two, fibers will form and will attach to the centromeres. In part two of mitosis the chromosomes will line up along the equator of the cell. In stage 3 of mitosis the chromatids will separate and will be tugged to the opposite side of the cell because of the fibers that are attached to the centrioles. During mitosis stage 4 nuclear membranes will form around the two sets of chromosomes. and then will unwind. All the fibers will disappear and the mitosis will be completed.We also learned about cytokinesis which refers to the division on a eukaryotic cell.