Cell Division & Cell Cycle Study Guide :: essays research papers

CELL DIVISIONCell division involves 2 phases1- MITOSIS The swear out by which nuclear material is divided 2 identical daughter cadres result2- CYTOKINESIS the dish up by which the cytoplasm and its contents (organelles) separate into equal parts. cytokinesis begins originally mitosis is complete cytokinesis differs in plant and animal mobile phonesANIMAL CELLS the cell membrane pinches near the meat of the cell, dividing the cytoplasm into equal parts(2 new cells)PLANT CELLS a cell plate develops across the centre of the cell, creating a new cell bulwark between the 2 new cells Cells alternate between stages (phases) of dividing and not dividing.This sequence is called the cell cycle. The 2 major phases of the CELL stave be1- DIVISION PHASE During this phase the cell undergoes mitosis (nuclear division) There are 4 phases of mitosisProphaseMetaphaseAnaphaseTelophase2- INTERPHASE During this phase, the cell takes in nutrients and builds proteins that are used by the cell fo r energy Chromosomes duplicate (DNA replication) This is the period of growth and repair for the cell (in preparation for the division phase)THE CELL CYCLECELL CYCLE the continuous process of mitosis, cell division, and interphase.HOW CELL GETS READY FOR MITOSIS Nucleus makes a copy of its chromatin(replication) Chromatin coils into double stranded chromosomes joined in the middle by a centromere 2 sets of DNA are bundled together nucleus is ready for mitosis to begin.Animal cell division cell membrane pinches near the middle of the cell, dividing the cytoplasm into 2 new cellsPlant cell division a cell plate develops across the centre of the cell, forming a new cell wall between the 2 cellsOriginal cell, parent cellNew cells, daughter cells of chromosomes in the nucleus of each cell is identical to eachother and to the number in the original cellWhy must nuclear membrane break down in mitosis?So that the contents of the cell can divide.The NUCLEUS controls the process of mitosis. R EGENERATION repair of injured cells or the making of lost body partsNormal Cell Replacement cells die when they receive instruction to do so when they are no longer needed