Let us consider a drop of water in a river. The droplet flows to a larger body of water such as a lake. From here, or even from the river, the droplet changes from the liquid to the vapor phase via the process of evaporation and goes into the atmosphere. In the atmosphere, the droplet is condensed back into the liquid phase in the form of cloud. When a sufficient amount of water has been created in the clouds, it precipitates back on to the ground and flows into rivers and streams again.<span />
They use it in the production of wire, space shuttles,etc.
The group of species with features best suited to its environment is more likely to survive
note: try and search for the peppered moth experiment (I think that is what it's called)
If a set of genes is induced in the presence of the controlling substance, it is referred to as positive control.
Genes are known as the basic unit of heredity. They contain a sequence of nucleotides which is responsible for the formation of a gene product that is functional.
The functional gene product is formed by the process of gene expression. In gene expression, there is first the formation of RNA from DNA by the process of transcription and then there is formation of a functional gene product by the process of translation from the RNA.
In the positive control, the expression of genes takes place only in the presence of a controlling substance that is known as an activator.
The set of genes are induced only in the presence of an activator, when there is positive control. The gene is not expressed in the absence of the controlling substance.
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