operations control

The operator gene controls the functioning of a specific series of structural genes. It lies adjacent to the structural genes which it controls. The cistrons are expressed when the operator gene is turned on by an inducer, and are not expressed when the ..

Control of the Heart Function - The control of the heart function is by a set of muscles and is, therefore, called myogenic . If the heart is removed from a living mammal and placed in a well oxygenated salt solution maintained at 37 o C, the heart continues to function though a..

This gene controls the operator gene in cooperation with a chemical substance called inducer present in the cytoplasm. A regulator gene is not necessarily adjacent to the operator gene which it controls. The regulator gene codes for and produces a protein ca..

A nuclear reactor is a device for obtaining and using the energy from a controlled nuclear chain reaction. Controlled means the rate or speed of the nuclear fissions can be changed by the operator. Most reactors are constructed in a similar manner. The six main p..

The co-repressor is a non-protein compound, which may come from outside or from metabolism within the cell. Its concentration controls transcription in the cell. If concentration of a co repressor rises, apo-repressor-co-repressor complex is formed, the complex binds with the operat..

Photocells are used in television camera to reproduce sound recorded on films, in counting devices, in burglar and fire alarms, to measure the temperature of stars, to study the spectrum of heavy bodies, to operate street light, to compare the illuminating powers of two sources, in ..

Rotation of crops improves the fertility of the soil and hence, brings about an increase in the production of food grains. Rotation of crops helps in saving on nitrogenous fertilizers, because leguminous plants grown during the rotation of crops can fix atmospheric nitrogen in the soil with th..

(i) Nitrogen is used in high temperature thermometers where mercury cannot be used. This is because mercury boils at 356.7 o C and hence cannot be used in such thermometers. A volume of nitrogen is enclosed in a vessel and introduced into the region of high temperature. Depending upon the temperatu..

. Such an mRNA transcribed from many genes is described as Polycistronic. The functioning of these cistrons is controlled by a stretch of DNA called operator, located next to the cistron Z. The cistrons synthesize mRNA when the operator switch is turned on and stop the..

1) Indiscriminate deforestation should be prohibited. 2) Wastage of timber and fuel wood to be avoided. 3) Alternative sources of energy, such as biogas should be used to supplement fuel wood. 4) Forest fires should be prevented. 5) Pests and diseases of the forest trees should be controlledh..