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The lac operon is an brilliant example of negative control or negative regulation of gene expression in which they bound repressor stops transcription of the structural genes. The Positive control or positive regulation of gene expression is when the regulatory protein binds to enhances and DNA the rate of transcription. In that case the regulatory protein is called as an activator. The CAP or CRP included in regulating the lac operon is a good instance of an activator. Thus the lac operon is subject to both positive and negative control.
abnormal lung volumes and capacities
What would be the approximate number of amino acids of a protein with a mass of 203 kd? Assume an average molecular weight for amino acids of 110 grams/mol.
Invasion or Migration - Ecology When a habitat is changed it can be a potential site for the establishment of many organisms. Many species actually invade or reach this new si
Q. What is the first polar body? How different is it from the oocyte II? In oogenesis the oogonium differentiates into oocyte I (2n) and this cell enters meiosis and after fini
Q. What is Rounded ST Depression? A rounded ST-segment depression pattern in the CM5 lead, as well as in the other leads, is common and is often associated with ischaemia. This
Photosynthetic function Structural organisation of the leaf is suitable to perform the process of photosynthesis. Hence leaf is called as a food factory. The leaf has a l
Ruminate Endosperm - Variants of Endosperm In certain plants the surface of the mature cellular endosperm shows a high degree of irregularity and unevenness, giving a ruminate
differnce between protonephridia and metanephridia
Human lungs A pair of spongy, elastic and bag like structures of lungs is present in the chest cavity, one on either side of the heart. Lungs are enclosed by a double lay
Which of the following statements about how B and T cells recognize antigen are true? a. B cells only recognize antigen presented by class I or class II MHC molecules. b. Both cell
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