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DNA damage caused by ultraviolet light: 1. Cyclobutane-type pyrimidine dimer is the major photoproduct formed 2. A second product, 6-4 photoproduct, is formed in about 10 % of UV induced pyrimidine dimmers 3. Cyclobutane type dimer can be reversed by a process known as photoreactivation (a) this is carried out by an enzyme known as DNA photolyase (photoreactivating enzyme) (b) significance of photolyase enzyme in humans is questionable 4. DNA photoproducts can also be repaired by excision repair
NERV E FIBRES - Axon or dendrite of a nerve cell covered with one, two or three sheaths is called nerve fibre. Dendrites are surrounded only by one sheath. An axon may b
What is the root cap? The root cap is a protective structure located in the tip of the growing root. It protects the meristematic tissue of the root forming a cap that surround
Why do membranes figure so prominently in eukaryotic cells? What essential function do they serve?
How are radioactive probes useful in DNA fingerprinting? Radioactive probes bind to specific fragments in a DNA sample like a donor gene. A probe can identify which bacteria ha
Define Metabolic utilization of carbohydrates? Following absorption, the monosaccharides enter the portal circulation and are carried to the liver. Both galactose and fructose
What is the relationship among environmental resistance and the population growth according to the biotic potential curve and the real population growth curve? The difference
Define the Disc Electrophoresis? Disc electrophoresis has improved resolution and strong bands are obtained. It requires a two-gel system and several different buffers. The run
study of phenomena of apical dominance
What is fixism? The Fixism is the theory about the diversity of life on earth that affirms that the current existent species were identical to species of the past and came out
How different are fecundation in osteichthyes and in chondrichthyes? In chondrichthyes fecundation is internal by means of copulation. In osteichthyes fecundation generally is
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