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Gene expression is the ability of a gene to produce a biologically active protein. This process is regulated by the cells of an organism, it is very important to the survival of organisms at all levels. This is much more complex in eukaryotes than in prokaryotes. A major difference is the presence in eukaryotes of a nuclear membrane, which prevents the simultaneous transcription and translation that occurs in prokaryotes. Initiation of protein transcription is started by RNA polymerase. The activity of RNA polymerase is regulated by interaction with regulatory proteins; these proteins can act both positively, as activators, and negatively as repressors. An example of gene regulation in cells is the activity of the trp operon. The trp operon encodes the genes for the synthesis of tryptophan. This type of gene, like the lac operon, is regulated by a repressor that binds to the operator sequences. The activity of the trp repressor is enhanced when it binds tryptophan; in this capacity,......
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Title: Regulation In Eukaryotic Cells
Approximate Word Count: 757
Approximate Pages: 4 (250 words per double-spaced page)
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Regulation In Eukaryotic Cells
Regulation in Eukaryotic Cells. Gene expression is the ability of a gene
to produce a biologically active protein. This process is ... ... -
Cells
... golgi bodies are a stack of membranous sacs, found in most eukaryotic cells, that
is ... a fluid-filled space and is used for storage of food or water regulation. ... ... -
Cytology, Genetics
... Prokaryotic and eukaryotic flagella differ greatly. ... acts as a "track" on which cells
can move ... the Discharge of vesicle content for water regulation in protozoa ... ... -
Cytology, Genetics
... Prokaryotic and eukaryotic flagella differ greatly. ... acts as a "track" on which cells
can move ... the Discharge of vesicle content for water regulation in protozoa ... ... -
Biology Study Guide
... c. Negative Feedback This is a common method of regulation in living ... 2. Eukaryotic:
all other cells Eukaryotic 3. animal cells all eukaryotic cells are very ... ...
