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10-kb DNA fragment digested with restriction endonuclease EcoRI yielded fragments 4 kb and 6 kb in size. When digested with Bam HI, fragments 1, 3.5, and 5.5 kb were generated. Concomitant digestion with both EcoRI and BamHI yielded fragments 0.5, 1, 3 and 5.5 kb in size. Give a possible restriction map for the original fragment.
Predict the products of each of the following reactions. Assume that a reaction occurs in each case. write a balance equation for each one. Mg(s) + Zn(No3)2(aq) -->
A mixture of 25.0 g of Mg and 25 g of B203 are allowed to react to completion. Identify the masses of MgO and B that are formed and determine the masses of any left -over reactants
The half-life for the radioactive decay of is 5730 years. How long will it take for 20% of the atoms in a sample of to decay. If a sample of initially contains 1.1 of , how many millimoles will be left after 2285 years
Calculate the change of entropy for the water, ΔSwater , and for the surroundings, ΔSsur , when 1.00 mole of water freezes at 0°C and the surroundings are at (a) 0°C, (b) -2°C. Explain the physical origin of the difference.
Suppose that.95g of water condenses on a 75.0g block of iron that is initially at 22 degrees Celcius. if heat released during condensation goes omly to warming the iron block, what is the final temperature in celcius of the iron block. (assume Con..
How many liters of ammonia gas can be formed from the reaction of 150 L of hydrogen gas? Assume that there is complete reaction of hydrogen gas with nitrogen gas and that all measurements are made at the same temperature and pressure.
Explain how to sketch a boiling point-composition figure for mixtures of toluene and water. With water mole percent of 20.2% as well as toluene mole percent 79.8% also a boiling point of 85* C.
The most common source of copper is the mineral chalcopyrite (CuFeS2) how many kilograms of chalcopyrite must be mined to obtain a 440 grams of pure copper.
What is the chemical formula of the "salt" produced by neutralization of potassium hydroxide (KOH). The highest possible oxidation number of nitrogen is
If you used 5.0 g of salicylic acid and excess acetic anhydride in the preceding synthesis of aspirin, what would be the theoretical yield of acetylsalicylic acid in moles and in grams
A system comprised of chloroform, 1,4-dioxane, and ethanol exists as a two-phase vapor/liquid system at 50 degrees C and 55 kPa.
At room temperature (20 degrees Celsius), milk turns sour in about 64 hours. In a refrigerator (3 C) milk can be stored 3 times as long before it sours. Explain how long should it take milk to sour at 40 C
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