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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.
Q. Which kind of circulatory system do molluscs have? How can it be compared to the respiratory system of annelids? Molluscs, with the exception of cephalopods, have an open ci
CHECKER BOARD (PUNNET'S SQUARE) METHOD 1. If the genotypes of the parents are known, the genotypes of their offspring can be easily predicted with the help of a chart c
a) What is the special property of a 'persistent' insecticide? b) In what ways is 'persistence' (i) a useful property, (ii) a harmful property? (a) A persisten
A decrease in parasympathetic discharge to the heart leads to A. an increase in the conductance of F-channels in SA node cells. B. a decrease in the conductance of potassium
Determine the blood plasma levels of glucagon A. production in the liver increases in response to an increase in blood plasma levels of glucagon. B. is secreted by alpha-isl
Is fecundation in mammals internal or external? Fecundation in mammals is internal, with copulation. In the contemporary world human technology is able to endorse artificial e
how do flatworm and round worms respire?
Haemoglobin Among the respiratory pigments we shall consider haemoglobin in some detail as this is the most familiar, widespread as well as the most efficient respiratory pigm
Preventive steps for global warming : Growing trees in vacant places. Growing social forests and protect them. Promoting abundant growth of phytoplankton plant species in marine
Cages for keeping animals in the science room It is frequently desirable in elementary and general science to stay animals caged in the science room for short periods of observ
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