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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
Q. As a result of the DNA replication two DNA molecules come into existence. Why is it not correct to assert that the two "new" DNA molecules are created? What is the name given to
Animals vs Plants Organisms are of two main types animals and plants, although all the above mentioned Unifying concepts of Biology apply equally to both animals and plants, ye
Describe Infectious Agents ? Recently there has been increasing interest in the relation between chronic low grade systemic inflammation and mortality of coronary artery diseas
Q. Why are glucorticoids used in transplant patients? In the treatment and prevention of this common problem patients are given other immunosupressants or glucorticoids, Glucoc
Explain about the RNA Viruses - carcinogenic? All oncogenic RNA viruses are retroviruses. They are of 2 types. They are acute transforming retroviruses and slow transforming re
Define Factors Affecting Microbial Survival and Growth? Microbes commonly present on the food, we have seen, include members of the genera Bacillus, Clostridium, Pseudomonas, S
What are the morphological similarities and differences among nematodes and annelids? Nematodes, like annelids, have a cylindrical elongated body. Annelids differentiate from
Explain water Universal Solvent ? Water - Universal Solvent : Water is usually referred to as the "universal solvent." because it is able to dissolve many different substan
Explain the Importance of nicotinic acid Nicotinic acid is successfully used in the therapy of a number of vascular disorders such as vascular spasms, angina pectoris, arthriti
Microtubule assembly: A) generally originates in the centrosome. B) occurs only during mitosis. C) occurs randomly throughout the cell. D) is regulated by myosin. E) is inhibited d
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