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It is possible to isolate mutant bacteria that are phenylalanine auxotrophs, that is they require phenylalanine in the medium in order to grow: non-mutant bacteria, of course, are able to synthesize their own phenylalanine via the shikimate pathway. A phenylalanine auxotroph (with one mutation in the shikimate pathway) is able to grow well in the presence of phenylalanine, but as soon as the added phenylalanine is used up, these bacteria stop growing and begin to excrete a metabolite of the shikimate pathway. Explain in detail why these bacteria don't begin to excrete this metabolite before using up the phenylalanine in the medium.
50.0 mL of 1.0 M HCl at 25.0 oC were mixed with 50.0 mL of 1.0 M NaOH also at 25.0 oC in a styrofoam cup calorimeter. After the mixing process, the thermometer reading was at 31.9 oC.
A 130 mL stock solution contains 1.3 M Na3PO4. When 10 mL of the stock solution is diluted to 21 mL, what will the concentration of Na+ ions be?
how many ml of concentrated sulfuric acid would be required to mae 1 L of 0.2N solution
The solubility of the ionic compound M2X3, having a molar mass of 238 g/mol, is 2.89 10-7 g/L. Calculate the Ksp of the compound
How many grams of F2 are needed to produce 237 g of PF3 if the reaction has a 80.4% yield?
Molten carbonate fuel cells fueled with H2 convert as much as 60% of the free energy relased by the formation of water from H2 and O2 into eletrical energy
A mixture of gases contains 0.290 mol CH4, 0.240 mol C2H6, and 0.300 mol C3H8. The total pressure is 1.40 atm. Calculate the partial pressure of the gases.
A 493 mL sample of solution contains 33.2 g of CaCl2 Calculate the molar concentration of Cl in this solution
A buffer having equal amounts of a weak acid and its conjugate base has a pH =4.4. A small amount of sodium hydroxide was combined to this buffer solution .
what pressure would it exert? (b) What pressure would it exert if it behaved as a van der Waals gas?
How many units would have been produced during the second quarter under Lean Production?
Calculate empirical formula of this compound & molecular formula and calculate the molality of solution of sulfuric acid?
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