The Cell Cycle

The cell cycle is a series of events from the time a cell forms until the cytoplasm divides. Most of the Life is spent in the Interphase, the interval between mitotic divisions when a cell grows. The Cell cycle occurs in all organisms, even singlecelled organisms.


As stated earlier, Interphase is the stage where the cell cycle is usually stuck at and is where the cell grows. The size if the cell just about doubles its cytoplasmic components and replicates DNA. The Three stages of interphase are G1, S and G2. G1 is metabolic activities where all growth happens; S is DNA synthesis and doubles the DNA; G2 is protein synthesis needed for cell division.


Prophase is the first stage of mitosis and is where Chromosomes further condense. One of the two centrioles moves to the opposite end of the cel, Microtubules assemble and lengthen which makes a spindle and Nuclear envelope breaks up. Also, Sister chromatids are attached to opposite centrioles.


Metaphase is the second stage of cell division, between prophase and anaphase. During Metaphase, the chromosomes of the cells attach to the spindle fibers.


Anaphase is the stage of meiotic or mitotic cell division in which the chromosomes break into the sister chromatids and move away from each other to opposite sides of the spindle.


Telophase is the final stage of mitosis, and is between anaphase and interphase, the start of the cycle once again. In this process, the two chromatids move to the opposite ends of the cells and two nuclei form.


Telomeres are noncoding repeat DNA sequences which is repeated thousands of times and is found at the ends of eukaryotic chromosomes. This protects the end of the chromosome from deterioration or fusion with neighboring chromosomes.


Cancer is a disease that comes about because of abnormal cells which divide uncontrollably and kill tissues. 15 to 20 percent of all human deaths in developed countries come from cancer. The disease get worse and worse until it is removed or eventually kills the victim.

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