- knolik
operon
Значение термина operon в knolik
operon - operon
operon - Group of closely linked genes responsible for the synthesis of a group of enzymes functionally related as members of one enzyme system; the activity of this group of genes in synthesizing messenger RNA being switched on or off by a single operator gene, which is also a part of the operon, but specializing in this controlling function. The genes controlled by the operator are called structural genes. The operator gene is itself controlled in one of two ways. Either it is switched off by a represser substance, which is produced by a regulator gene (not part of the operon) and which can be inactivated by some metabolite or signal substance (an effector) coming from elsewhere in the cell or from outside the cell; so that the presence of the effector results in the operon becoming active. Or it is switched off by a represser which is a combination of a substance (itself inactive) from the regulator gene with an effector from elsewhere; so that the presence of the effector results in the operon becoming inactive. Operon systems are concerned in the control of gene activity in bacteria, as in the formation of adaptive enzymes; and may be concerned in other organisms.
Рядом со словом operon в knolik
| operculum | В начало буква "" буквосочетание "" | ophidia |
Статья про operon была прочитана 209 раз
- - TOP 200
- - mycophyta
- - alloys furnaces
- - binomial nomenclature
- - alloys, bronze
- - ainley, henry hinchliffe
- - august 21
- - ranunculus trichophyllus chaix
- - ranunculus fluitans lamarck
- - ranunculus hederaceus l.
- - ranunculus heterophyllus weber
Our friends, knolik encyclopaedia knolik.com