How+cells+arise

= __How Cells Arise__  = The Cells Theory tells us that all cells come from existing cells and it also explains that all organisms are made of one or more cells

New cells are created by old cells dividing in to two which is a process call Mitosis. Mitosis is the process by which a eukaryotic cell the chromosomes in it's cell nucleaus into to indentical sets in two nuclei.

A:__Interphase__- the phase of the cell cycle in which the cell spends the majority of it's time and performs it's purposes including preperation for cell division B:__Metaphase__- condesed of highly coiled chromosomes, carry gentic information, align in the middle of the cell before being seperated into each of the two daughter cells. C:__Anaphase__- chomosomes seperate in eukaryotic cells. Moves to opposite poles of the cell, the opposite ends of the mitotic spindle. D:__Telophase__- effects of the prophase and prometphase events are reversed. Then the two daugher nulclei form in the cell.

Another type of asexual reproduction is called Binary Fission. Binary Fission is a sexual reproduction by a seperation of the body into two new bodies. In this process of Binary Fission an organism duplicteu8s its gentic material or DNA, and then divides into new parts, which each new organism-receiving one copy of DNA. A:__Prokaryotic Chromosome__-organized structure of DNA and protein that is found in cells. It is a single piece of coiled DNA containing many genes, regulatory elements and other nucleotide sequences B:__Duplication of Chromosomes__- when the chromosome multiplys and forms into two. C:__Countinued Growth of Cells__- the cells continues to grow D:__Division into two cells-__ the cell becomes two and the process starts over again

Organisms that reproduce sexually make special sex cells through a process known as Meiosis. Mesiosis is a special type of cell divison nessary for sexual reproduction. In animals meisosis produces gametes like sperm and egg cells.

The decision whether it needs to be divided not depends on the size. The bigger the cell is, the more food it will need. Since food is taken in through the membrane if a cell is too big.

media type="youtube" key="KuJqqiATlqw" height="390" width="480" = __Facts__ = In 1858, Rudolf Virchom, a doctor stated that all cells could form from only from other cells. Virchow then added the third part of the Cells Theory. Robert Hooke was the first person to describe cells.

= __Links__ = [|Cell Theory by Wikipedia]