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Ribonucleic acid (RNA) and deoxyribonucleic acid (DNA) have ribose and deoxyribose as the pentose sugar, respectively. They also differ, to some extent, in possession of nitrogenous bases. DNA contains four types of nitrogenous bases -adenine, thymine, cytosine and guanine, while RNA contains uracil in place of thymine and the three other bases as in DNA. Figure illustrates the chemical structure of these nitrogenous bases.
How has the earth changed since it was formed? Ans) The earth has changed particularly since it was formed. Earth was a ball of rock that was strike and changed by loads of imp
what is an enzyme
Chemical reactivity : The substances which react violently or produce flame on contact with water can be given suitable chemical treatment to convert them into nonreactive form be
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Acute and Chronic Effects : The effects of accidents due to chemicals are severe and immediate on the human body. These effects are called acute effects and can be traced without
Venus-the Clouded Planet Venus, our nearest planetary neighbour, only 40 million km away, has its surface hidden from view by a dense yellowish-white cloud, which extends to 80
Question: a) Describe wet bulb thermometer and wet bulb temperature. b) What happens to the volume of a rising parcel of air and of a sinking parcel of air? c) What do yo
Explain the Creatinine Clearance Test It determines how efficiently the kidneys are clearing creatinine from the blood and serves as an estimate of kidney function. It compare
Laboratory Safety Codes: BIS has prepared the following three codes (in the form of small books) regarding laboratory safety: i) Code of safety in microbiological laboratories
In what layer of the Earths atmosphere does most of our weather occur? Troposphere
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