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Explain how early RNA molecules might have been able to respond to natural selection.
Every RNA molecule might have competed with slightly dissimilar RNA molecules for nucleotides. An RNA molecule that was more successful in getting nucleotides would have an advantage, and it would pass that advantage on to the new RNA molecules it formed by replicating.
Ulcerative enteritis (quail disease) Ulcerative enteritis, caused by Clostridium colinum, is found in chicken, quails, pheasants, turkeys and some other birds. Clostridial or
Water Pollutants - Water Pollution Water pollution can occur on account of any one or more of the following agents: 1. Biological: Pathogens such as virus, bacteria,
Exploitation of Forests Exploitation of our forests for commercial purposes and for food and fodder cannot be stopped completely because of symbiotic relationship between fore
When a ventricQlar septa1 defect (VSD) is present, with no aortic stenosis, the peak velocitgr across the defect reflects the difference in pressure between the right ventricle an
Do fishes there an open or closed circulatory system? How many chambers does a fish heart have? How does blood flow all through the fish body? As in every vertebrate the circul
Soil Mixing The larger soil organisms are responsible for considerable mechanical mixing and weathering of soil. The wedge-like action of roots and other underground plant orga
Explain about the Glycemic Index (GI)? In the previous sections, we have studied that some carbohydrates are rapidly digested and absorbed, some are digested slowly while some
Phosphofiuctokinase-I Phosphofiuctokinase-I is activated by AMP and inhibited by ATP and citrate. When ATP is utilized in energy requiring process, the concentration ofAMP
What are heterochromatin and euchromatin? Chromatin is uncondensed nuclear DNA, the typical DNA morphology in interphase (the phase of the cell cycle in which the cells is not
What is Lymphatic Network? The lymphatic network consists of the lymphatic vessels, which circulate lymph throughout the body. Lymph is a liquid which carries out exchange of g
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