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Transcript of Cell Divison
The function of cell division is to produce more cells for growth and repair processes. Mitosis -Mitosis Function:
Division of the nucleus. Stages of Mitosis When cell division begins the chromatin threads coil and shorten so that the chromosomes are then visible.
Chromatid (chromosomes made up of two strands) are held together by centromere.
The centrioles separate and move towards opposite sides of the cell creating the mitotic spindle (composed of thin microtubules).
At the end of prophase, the nuclear envelope and the nucleoli would have broken down and disappeared, and the chromosomes have become attached randomly to the spindle fibers by their centromeres. During interphase, which is the longest stage of the cell cycle, the cell is very active and is resting only from division. Prophase Interphase/Metabolic Phase The chromosomes cluster and become aligned at the center of the spindle in the middle between the centrioles so that a straight line of chromosomes are visible. Metaphase During anaphase the centromeres holding the chromatids split and start moving slowly apart toward opposite ends of the cell.
Anaphase is over when chromosomes stop moving. Anaphase Telophase Telophase is almost the same thing as prophase except in reverse.
The chromosomes begin to uncoil and and become threadlike chromatin again.
The spindle breaks down and begins to disappear, then a nuclear envelope begins to form around each chromatin mass, and nucleoli appear in each of the daughter nucleoli. -What is the importance of mitotic cell division?
Mitotic cell division is important because it creates an exact copy of the original mother cell with the exact genetic information from the original fertilized egg from which it came. Mitotic Cell Division? DNA also serves as a blueprint to protein synthesis.
Proteins are key substances for all aspects for cell life.
A gene is a DNA segment that carries the information for building one protein or polypeptide chain. DNA in Protein Synthesis -RNA ( ribonucleic acid)
RNA functions as the decoder and messenger for specifying the structure of proteins to be built at the ribosomes.
-Transfer RNA (tRNA):
small cloverleaf-shaped molecules that ferry amino acids to the ribosomes.
-Ribosomal RNA (rRNA):
helps form the ribosomes, wher proteins are built.
-Messenger RNA (mRNA):
long, single nucleotide strands that resemble half of a DNA molecule and carry the "message" containing instructions for protein synthesis from the DNA gene in the nucleus to the ribosomes in the cytoplasm. Varieties of RNA Prophase Comparing Cell Types Epithelial Skeletal muscle and smooth muscle cells Fat cell Erythrocytes Macrophage Fibroblasts Nerve cell
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