from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A unit of genetic material that functions in a coordinated manner by means of an operator, a promoter, and one or more structural genes that are transcribed together.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A unit of genetic material that functions in a coordinated manner by means of an operator, a promoter, and structural genes that are transcribed together.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a segment of DNA containing adjacent genes including structural genes and an operator gene and a regulatory gene
In at least one case, IS elements activate an operon during starvation only if the substrate for that operon is present in the environment. (emphasis mine)
It was largely the work of FranÃ§ois Jacob and Jacques Monod and led, at the beginning of the 1960s, to the identification of messenger RNA as the mediator between genes and proteins, and to the description of a regulatory model of gene activation, the so called operon-model, in which two classes of genes became distinguished: One class was that of structural genes.
Now, an operon is a little segment of DN A in a bacteria which codes for a couple of genes, and genes code for proteins, and the proteins usually have related functions or function as a group, and one of them is called the lac operon which is used to, the proteins of which are necessary for the bacterium Escherichia coli to metabolize a sugar called lactose, which is a milk sugar.
Xia L, Zuber P (1991) Transcription initiation region of the srfA operon which is controlled by the comP-comA signal transduction system in
Results from analysis of the gene sequence, reverse transcriptase PCR, and enzyme assays indicated that dntD dntE ORF13 dntG composes an operon that encodes the lower pathway.
While mutations are random, doesn't Barry Hall's work strongly suggest that with the ebg operon the mechanism generating the mutations appears to be responding to environmental cues?
Jarrell 2007 Systematic deletion analyses of the fla genes in the flagella operon identify several genes essential for proper assembly and function of flagella in the archaeon, Methanococcus maripaludis.
Iino 1995 Functional analysis of the flagellar genes in the fliD operon of Salmonella typhimurium.
Other hand, we postulate that the duplicated gene is transferred through nichthomologe, intrachromosomal recombination in an operon of the secretion apparatus, so that would be at the same time the temporal expression control and perhaps the quantity produced so happens to be true to some extent.
In other words, Davescot made two mistakes in a single posting: first he confused citrate with the Lac operon and secondly, he incorrectly claims that ‘Darwinian gradualism’ is denied once again, because, after all, a stochastic event affects whether E. coli can digest lactose versus glucose.
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