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Q. What are the main causes of Mutation?
Some mutations take place randomly and spontaneously during process of mitosis or meiosis. Others are caused by mutagenic agents that are environmental or man-made factors that can increase frequency of mutation. Environmental factors like ultraviolet rays of the sun can cause changes in DNA which can result in skin cancer. Cosmic rays from space that penetrate earth's ozone layer are also a cause of mutation. Ionizing radiation like X-rays, gamma rays and nuclear radiation produce free radicals (atoms with unpaired electrons) in the cell which can cause breaks in DNA molecule. Carcinogens are chemical mutagens which cause gene mutations which can lead to cancer. A few instances of carcinogens are asbestos, benzene, some food dyes and PCBs.
Q. How can the tubular-dorsal nervous system in chordates be compared to the nervous pattern present in invertebrates? In chordates the nervous system is dorsal and highly ceph
Biodynamic: This dealing with energetic of organisms. Biodynamic is a method of organic farming which treats farms as unified or individual organisms, emphasizing balancing the ho
Q. Etiological factor of diverticular disease? The causes of diverticular disease are not certain, but several factors may contribute to changes in the wall of the colon. These
What is the Speech Perception Test The subject is asked to listen to a series of 60 sounds, each of which consists of a double e digraph with varying prefixes and suffixes. The
What are the Body Fat Measurements? Obesity is best classified in adults based on Body Mass Index (BMI) classification. BMI, you already know, is a measure of body jut based on
RADIOGRAPHY You have read in GNM courses about radiographical examination. In this text the discussion will be on the following radiographical tests. Chest Roentgenogram
Explain the Failure to Management of Ledge Apical transportation or perforation: movement of the physiological foramen to a new iatrogenic location. Three types of apical tr
Q. What are the signs of myocardial disease? One manifestation of congestive cardiac failure is decreased exercise tolerance depending on the level of compensation. This leads
Early campaigns of the 19th century that focused on sanitation, hygiene, housing, and nutrition had little effect in controlling communicable disease due to flawed rationale based
Types of Metamorphic Changes The process of metamorphosis includes reactivation of the morphogenetic processes. The morphogenetic changes also the mode of causation of these
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