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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.
How different are oxyhemoglobin and hemoglobin? Where is it expected to find a higher concentration of oxyhemoglobin, in peripheral tissues or in the lungs? Oxygen-bound hemogl
Explain some Precautions for Preparation of Chloride Buffers? 1. Glass electrodes should always be before and after measuring pH with a tissue paper. 2. The pipettes should
Fixed-Dose Combinations A combination formulation of rifampin, isoniazid and pyrazinamide (Rifater) is approved by the FDA for the initial 2 months of daily anti-tuberculosis
Define Protein Requirement for Cancer Patients? Both the metabolic stress of cancer, as well as, chemotherapy results in increased tissue catabolism. Hypoalbuminemia and anaemi
Explain characteristics that make breastfeeding beneficial to the infant? We have listed some characteristics that make breastfeeding beneficial to the infant: • Mature milk
What are niches and competitive exclusion?
Determine Health Hazards Associated with High Altitude? Abrupt exposure to altitudes greater than 10,000 ft (3050 in) elevation is frequently associated with symptoins of altit
Eubiont The origin of true life , eubiont from a pmtobiont involves the acquisition of three major features: 1) assembly of phospholipids and proteins into a cell membrane f
Lower Respiratory Tract: Trachea: Trachea or windpipe is 12 cm long, 2.5 cm in diameter lying in front of the esophagus and ends opposite the fourth dorsal
what is the mode of nutrition of ascaris
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