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Explain the Bohr's model?
Bohr's Model : Electrons move around the nucleus at tremendous speeds and occupy most of the space in an atom. The exact position or location of an electron at any given moment can only be predicted on the basis of probability. In a widely accepted model of the atom originally proposed by Neils Bohr, electrons move in spherical spaces called orbitals, or shells, which correspond to different energy levels. Electrons are distributed according to their energy levels, with the higher energy electrons residing in the outer shells. The innermost shell contains only 2 electrons. In common elements, the next outer shells contain 8 electrons each.
Atoms either gain, lose, or share electrons in the outer shells. Because the outer shells of many atoms are incomplete, most atoms will interact with other atoms during chemical reactions to achieve stable outer shells. The number of electrons that an atom must either gain, lose, or share to complete the outer shell is known as its valence, or oxidation number. For example, carbon has six electrons, two in its first energy level and four in the outer level. Thus, it can form a stable outer shell by gaining, losing, or sharing four electrons to complete its outer shell when it joins, or bonds, with another atom or atoms to form a compound. The following table lists the oxidation numbers of some important ions frequently used in Biology.
E n z y m e - linked immunosorbent assay (ELISA): ELISA in its var io us modifications e.g. plate ELISA, sandwich ELISA, competitive ELISA, ELISA strip or
What is diarrhoea? Diarrhoea is characterized by the frequent evacuation of liquid stools, usually exceeding 300 ml, accompanied by an excessive loss of fluids and electrolyte
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summarise the comparative anatomy of the digestive system of the invertebrate and the vertebrate.
There is a population of 100 frogs. 20 are heterozygotes, 30 are homozygous recessive, 25 are homozygous dominate. What is the frequency of the dominate allele? The recessive allel
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Zearalenone It was first isolated as the agent responsible for vulvovaginitis in pigs has very little acute toxicity, but there should be some concern about chronic exposure t
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Respiratory Gases -Respiration Physiologically the most important gases are oxygen, carbon dioxide and nitrogen. Molecular oxygen comprises 21% of the atmosphere; carbon diox
Is there vaccine against tuberculosis? The vaccine against tuberculosis is known as BCG (bacillus Calmette-Guérin). BCG is not used in some countries where tuberculosis is not
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