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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.
DIGESTION Digestive enzymes break down food particles into smaller units. You will see that the final breakdown products of protein digestion are single amino acids or small c
Explain Following Trems (a) State three structural features of prokaryotic cells. (b) Describe the functions in eukaryotic cells of lysosomes, ribosomes, and centrioles.
Differential reinforcement of other behaviour (DRO) This is used to decrease frequent behaviour by reinforcing any behaviour other than the undesired one. An instance would be r
Define Chromatography - Basic Separation Technique? Chromatography is the most effective technique for the separation, purification and identification of one or more biological
Q How does the presence of exoskeleton describe the general small size of arthropods? Since they have periodic ecdysis and exoskeleton, the growth of arthropods is limited to a
Congenital disorders Poor fertilizing quality of semen could be due to impaired spermatogenesis. When such a condition is due to genetic congenital causes the treatment is not
Sterile Technique Every effort should be made to conduct implant surgery under sterile operating conditions. Chlorhexidine 0.2% is used as a pre-operative mouthwash and skin pr
Occurrence of vitamin B 12 Vitamin B 12 is one of the cobalamin, a group of active principles widely occurring in nature. Vitamin B 12 is present especially in liver, kidney
STRUCTURE Golgi body consists of :- (1 ) Cisternae These are plate like unbranched structure with dilated ends. One golgi body has 4-8 cisternae. Mono cisternal
The general mechanism of RNA synthesis by these eukaryotic RNA polymerases is the same as for the prokaryotic enzyme that is: ? The initiation of RNA synthesis by RNA polyme
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