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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.
Q. Is there chloroplasts in cyanobacteria? In cyanobacteria there is no chloroplast and the chlorophyll layers are dispersed in cytosol.
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Q. Distinguish among the terms stimulus, sensation, and perception? A stimulus is an energy source (chemical, light wave, pressure etc.) which activates a receptor cell (specia
Dinoflagellates are single-celled to colonial protistans characterized by the two flagella, one girdling cell and the other trailing the cell. Some of the dinoflagellates exist in
The first step should be to determine the status of dehydration. We have already talked about the mild, inoderate and severe dehydration. In mild to moderate cases fluid, electroly
What is Endocrine System explain ? The endocrine system consists of glands, organs that secrete hormones. Endocrine glands are tissues that produce secretions within the body,
Q. Explain about biological diversity? Biodiversity or biological diversity is a neologism and portmanteau word, from bio and diversity. It is the diversity of and in living na
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 Most Probable Number Test (Multiple Tube Fermentation Test)? Presence of coliforms in the water sample can be detected by performing multiple tube fermentation test whic
Q. Effect on Microbial Growth of pH? Every microorganism has a minimal, a maximal, and an optimal pH for growth. In general, bacteria grow in the pH range of 6.0-8.0, yeasts 4
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