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Enzyme Synthesis
Nitrate assimilating system in general is known to show increase in nitrate uptake system and nitrate reductase system in the presence of nitrate. In other words, nitrate assimilatory system is induced by the presence of nitrate. Similarly, cells or organisme assimilating NH3 as nitrogen source show lack of nitrate assimilatory system. Such control of nitrate is called repression control. Thus nitrate is an inducer while ammonia is repressor of nitrate assimilatory system. Red light is known to enhance synthesis of nitrate assimilatory system and this light effect is mediated by well-known photomorphogenic pigment called phytochrome.
respiration through moist skin
EVOLUTION OF MAN - Mammals evolved from primitive reptiles (therapsida) in Triassic period, about 210 million years ago. Mammals existed as inconspicuous group of small
System of classification The Enzyme Commission divided enzymes into 6 main classes, on the basis of the total reaction catalyzed. Each enzyme was assigned a code number; consis
what are the principle sources of excessive nitrate and phosphate in rivers and lakes?
Change in nucleus during cleavage
How is retaining wall works? A retaining wall together with the backfill the wall retains and the soil that supports the wall is a highly indeterminate system. The magnitudes o
why phloem made of living cells
Plasma Proteins - Circulation The total protein concentration of the plasma is around 7% only. The plasma proteins are of three types - serum albumin (4%), serum globulin (2.7
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What are Flavanols? Examples are catechin and epicatechin. You may have heard of the benefits of tea. Some of them are due to gallic acid, which is combined with epicatechin. F
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