Forensic scientists have to work often ...

Forensic scientists have to work often with extremely small samples of DNA obtained from the hair or other sources of suspected criminals. However, it is possible to produce DNA 'fingerprint' from these small samples by using

gene gun

gene cloning

polymerase chain reaction

genetically engineered microorganisms

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Hydocarbons, obtained from coal and coal tar and from oil and gas wells, are organic compounds composed entirely of C and H. A 0.1647 g sample of a pure hydrocarbon was burned in a C - H combustion train to produce 0.4931 g of CO_(2) and 0.2691 g of H_(2)O . Determine the masses of C and H in the sample and the percentages of these elem ents in the hydrocarbon. Strategy: Step 1 . Use the observed mass of CO_(2) to determine the mass of C in the original sample using the information that there is 1 mol of C atoms in each mole of CO_(2) . Step 2 . Use the observed mass of H_(2)O to calculate the mass of H in the original sample using the fact that there are 2 mol of H atoms in each mole of H_(2)O . (We can also calculate the mass of H by subtracting the mass of C from the mass of sample. However, it is good experimental practice, when possible, to base both on experimental measurements as this would help to check for errors in the anlysis of calculation.) step 3 . Calculate the percentages by mass of each element in turn, using the relationship % Element = ("Gram of element")/("Gram of sample") xx 100 %

ARIHANT NEET-BIOTECHNOLOGY : PRINCIPLES AND PROCESSES-Chapter exercises (Taking it together (Assorted Questions of the Chapter for advanced Level Practice ))

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This figure shows the restriction site of Eco RI. This restrictio...
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The polymerase chain reaction generated a fragment of a distinct size ...
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Forensic scientists have to work often with extremely small samples o...
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