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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
Moss Stage - Xerarch The accumulation of soil, particularly in the crevices and depressions of rock favours the growth of certain xerophytic mosses, e.g., species of Polytrich
Q. What are the main chemical compounds that destroy the ozone layer? The major chemical compounds that destroy the ozone layer are the CFCs, chlorofluorocarbons, or freons, su
What is Anti-arrhythmic pacemaker defibrillators ? Antiarrhythmic drugs (AADs) are classified according to whether they exert blocking actions predominantly on sodium, potassiu
Q. What is Atrial Extrasystoles? Atrial premature beats often occur at lower workloads and have little significance. As exercise increases, they usually subside and may then re
How do the cDNAs vary from the original genes? A. The inserted cDNA copies lack enhancers, promoters and introns. B. The genomic structures of the original gene and the ins
Q. What is the crystallization of a virus? What is the significance of this process? Crystallization is the procedure of transformation of viral components into organized solid
What are the main interspecific ecological interactions? The major harmonious interspecific ecological interactions are: protocooperation, mutualism and commensalism. The major
Bilateral - Metazoa Bilaterally symmetrical animals have the major axis running from head (anterior) to tail (posterior). They have a ventral (lower) and dorsal (upper) surfac
Question 1 Describe any two possible mechanisms of mutagenesis 2 Explain any five functions of Endoplasmic reticulum 3 Write short note on Ames test 4 Describe the structure an
Q. Rules of Nomenclature classification? The Rules of Nomenclature prescribed the categories into which plants should be classified. These categories constitute the units of cl
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