| homomorphism | 1. <biology> Same as Homomorphy. 2. <botany> The possession, in one species of plants, of only one kind of flowers; opposed to heteromorphism, dimorphism, and trimorphism. 3. <zoology> The possession of but one kind of larvae or young, as in most insects. See: Homomorphous. Source: Websters Dictionary (01 Mar 1998) |
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| met repressor operator complex | Repressor protein, 104 residues, product of the metJ gene, which regulates methionine biosynthesis in E. Coli. Dimeric molecules bind to adjacent sites 8 base pairs apart on the DNA, sequence recognition is by interaction between antiparallel strands of protein and the major groove of the B form DNA duplex. (18 Nov 1997) |
| operator | <molecular biology> The site on DNA to which a specific repressor protein binds and prevents the initiation of transcription at the adjacent promoter. (18 Nov 1997) |
| operator gene | A gene with the function of activating the production of messenger RNA by one or more adjacent structural loci; part of the feedback system for determining the rate of production of an enzyme. (05 Mar 2000) |
| operator region | <genetics> DNA sequences which signal the initiation of transcription when derepressed. (12 Dec 1998) |