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Gene repressor proteins which inhibit the transcription of particular genes in eukaryotes also exist. They may act by binding either to control parts within the promoter region near the gene or at sites located a long distance away from the gene, called as silencers. The repressor protein should inhibit transcription directly. One instance is the mammalian thyroid hormone receptor that, in the absence of thyroid hormone represses transcription of the goal genes. Furthermore, other repressors inhibit transcription by blocking activation. This can be get in one of several ways: by blocking the DNA binding site for an activator protein, through binding to and masking the activation domain of the activator factor, or by forming a non-DNA binding complex with the activator protein. Several instance of every mode of action are known.
Biota of Lakes Lakes exhibit life zones. So far you have been reading about the vertical zonation of lakes. The lakes can be divided into horizontal zones as well. This divis
Define role of Vitamin A in controlling gene expression? Vitamin A as retinoic acid has widespread effects on the synthesis of a variety of important proteins. These diverse ef
Cry o Preserved Allografts (Homograft) : As these are not mounted, a free hand suturing in two layers has to be done. The valve is thawed by protocol. The septal muscle i
Circulatory Systems in Animals In animals that have efficient circulatory systems and readily permeable vascular skins, gas exchange occurs through the integument. Thus we fin
BASICS OF ENVIRONMENT We live in two world one is natural world of animals, plants, air, water and soil that was present since the evolution of earth. The other world is of soc
what is micelle
Q. What is Tall T-Wave? It has been reported that tall T-wave during or after exercise indicate inferior wall ischaemia. However, Ellestad reports the findings that tall T-wav
merits and demerits system of classification by Linnaeus
Why does bark often die and break naturally? The bark is the mature periderm of the stem, branches and roots. It dies and breaks when these structures grow and thus the perider
The water on earth surface constitutes hydrosphere. About 75% of earth surface is covered with water and 97% of that water is present in oceans, which is very salty. We are only
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