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Microbes:
You should know that invisible microbes are present everywhere, because they can surviveeven under very inhospitable conditions. They are all around us, in the air we breathe, in thsoil, in food, ih water used for drinking or bathing and on all the objects we come in contacwith. You will be surprised to know that billions of them live on the skin of our body and inour mouths and intestinal tracts. One third of the dry human faeces is bacteria. However, only some of these micro-organisms cause infectious diseases. There are many others whicare beneficial and their activities are of central importance to the biosphere. Without them life on earth would perish! Long before we even knew of their-existence, we have been taking advantage of their activities, as in the case of making curds, and alcohol or baking cakes and bread. They decompose dead plants and animals, as well as sewage into harmlesbut indispensable chemicals like nitrogen, oxygen and carbon dioxide etc. They can also bused as biological factories to produce antibiotics.
In fact, the famous antibiotic, penicillinwas discovered from a culture of fungus. Certain kinds of bacteria live in human intestinesand provide vitamin B,, and vitamin K. Thus, though some microbes are harmful, athers aof great service to humanity. While the knowledge of gems has grown and some of it is used to save people from disease and death, several countries have used this knowledge fodestruction and warfare. You may have heard the word "geim warfare". These countries have collected deadly gems which can be spread in enemy countries to pollute air or wateor even to destroy crops and forests. Such warfare, obviously, kills people, not just soldierand as such it is internationally prohibited.
Explain the Actions of Autonomic Nervous System (ANS) The actions of the autonomic nervous system are largely involuntary (in contrast to those of the somatosensory system). Th
Explain what is Argininosuccinate Synthetase In a 2-step reaction catalyzed by the cytosolic enzyme argininosuccinate synthetase, citrulline and aspartate are condensed to form
Radiation: High doses of radiation are very harmful for human health. Do you know about the disaster ceated by the first atomic bombs which were exploded on two cities of Japa
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Chemical Reactions of Amino Acids The chemical reactions of amino acids can be divided into three classes: i) Reactions of carboxylic group ii) Reactions of amino group
give examples for one energy transformed to another energy
Enzyme immobilizatio:- The attachment of an enzyme to a solid matrix so that it cannot escape but can still act on its substrate. .
Surfaces of colloidal fractions of clay minerals The surfaces of colloidal fractions of clay minerals and humus are responsible for the cation and anion exchanges between soil
Specific Acquired Immunity Body in the long run develops specific immune mechanisms for each species. These mechanisms are not innate but are acquired after exposure to the spe
Explain Mucous membranes - External Defence Mechanism Mucous membranes: The digestive, urinary, genital and respiratory tracts open out at one or both ends. They do not have a
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