Gene Expression

Topics: DNA, Gene, Genetics Pages: 2 (385 words) Published: November 14, 2011
Lucas Lindsey
Mr. Mazhawidza
Mircobes to Society 118

Gene Expression

By definition of gene is defined as the basic physical unit of heredity. a gene is a linear sequence of nucleotides that makes part of a segment called DNA. Deoxyribonucleic acid (DNA) is a nucleic acid that contains genetic codes in the development and functioning of all known living organisms. DNA provides a a linear sequence of nucleotides along a segment of DNA that provides very important codes that make up humans for who and what they are. The process of gene expression is a process that is continuously regulated by the cells nucleus in the regulation of proteins. However, this long coding process has to start somewhere. As I said earlier this function is carried out by a cells nucleus where membranes regulate the function of what enter and leaves the cells through a wide range of mechanisms. On the outside of the membrane, certain receptors are triggered to certain proteins inside the cells cytoplasm. A certain receptor is made that enters the cells nucleus reacting with the DNA, in desire for the expressed gene. Expression is complex process upon which there are many steps which undergo. One is transcription. This is where a copy of one side of genetic information is made to be stored in DNA. Upon starting transcription, proteins are made to read the DNA called rRNA. A second process is involved called splicing. This is where unnecessary parts of RNA are made to create the gene the protein has sent out to make. After all necessary changes have been made to RNA, mRNA is decoded by the ribosome to produce a specific amino acid chains, or polypeptide, that will later fold into an active protein. This sets up the last set of what it takes to make the necessary protein. Posttraslational modification is the chemical modification of a protein after translation synthesis and is the final result of the process gene expression, which leads to the expression of...
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