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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 effects are due largely to its combination with one or more nuclear receptors that serve as trans-acting factors that promote transcription. Several different receptors have been identified and each has a specific mode of action in growth and development. For example, should a mutation occur in the receptor, which would result in decreased retinoic acid binding, embryonic cell differentiation is affected, with the result of embryonic wastage or foetal malformation? Congenital heart malformation has been attributed to such a mechanism.
Congenital Syphilis A positive serological test for syphilis in a newborn without stigmata of syphilis may be due either to passive transfer of maternal antibodies or to prena
what is the food getting habits of phylum coelenterata?
Islet of Langerhans: They are insulin-producing tissues. It was discovered by Paul Langerhans in 1869. These cells are in groups and look like islands in the pancreas. There are ab
Explain the term Intracellular Filaments? Intracellular Filaments : The cell contains fibrous proteins which serve to give the cell its shape and internal organization and fo
Q. What do you mean by synapses? Synapses are the structures that transmit the neural impulse between two neurons. When the electric impulse arrives the presynaptic membrane
F ALLOPIAN TUBE - Fertilisation occur in it. 10-12 cm long muscular tube. It is supported by double fold of peritonium. It shows 4 regions - (i ) Infundibulum - Bro
Explain the Infarct Exclusive Technique? Infarct Exclusive Technique : Left ventriculotomy is done through the infarcted area. No attempt is made to close the ventricu
In what forms are nitrogenous wastes excreted in birds, humans and aquatic turtles respectively ? Why so, describe?
Q. What are the cnidocytes? What is the name of the capsule inside the cnidocyte? What are the biological functions of this structure? Cnidocytes are specific cells present in
Thoracic (non-cardiac) Antibiotic prophylaxis is given routinely in thoracic surgery, but sup- porting data are sparse. In one study, a single preoperative dose of cefazolin be
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