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What are mutagenic agents?
The Mutagenic agents, or mutagens, are physical, chemical or biological factors that can cause alteration in DNA molecules.
Instances of believed or well-known to be mutagenic agents are: X, alpha, beta and gamma rays, ultraviolet radiation, nitrous acid, many dyes, some sweeteners, some herbicides, many substances of tobacco, some viruses, like HPV, and so on. Small DNA fragments called as transposons can also act as mutagens when incorporated into other DNA molecules.
Classification of Living Organisms The world of living organisms is extremely diverse. Biologists call these diverse forms 'species'. It is estimated that over fifteen lakh (1
Limitations of Five-Kingdom Classification As already pointed out, each system of classification has its own limitations. The two-kingdom system has outlived its usefulness as
Q How do cells get energy for their functioning? Cells get energy for their metabolic reactions from the breaking of organic molecules with high energetic content. This energy
Open Mitral Valvotomy : Technique: A median stemotomy is done; peri cardium opened and stay sutures taken. After heparinisation ascending aorta is cannulated and then SVC
Rheumatic Fever and Rheumatic Heart Diseases Rheumatic fever is an inflammatory disease of the heart potentially involving all layers of the heart. The resulting damage to t
Long-hair in cats is due to the recessive long-hair allele, l. Black cats (rather than tabbies) are due to the recessive agouti allele, a. A long-haired black female cat has mat
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Stage two using a mucoperiosteal flap A Mid crestal incision over the implant site is made and reflection of mucoperisteal flap is done under local anesthesia. After locating t
Define Surface Sampling Food contact surfaces (e.g. storage tank, packaging material, ripening room, utensils, equipments, refrigerators etc.) which directly or indirectly (wal
Q. What are the few examples of the structural function of organic molecules? Ans. Organic molecules have a structural function as they are part of cell membranes, organ w
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