- Why gram positive bacteria purple in colour while gram negative are red?

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Can someone show me step by step how to do number 12. The answer is 9 but I keep getting 7!? PH of a solution that results from mixing together equal volumes of a .0600 M solution of NH3 and a .0300 M sol'n of HCl? pKa of NH4+=9.25.? Does sqrt((-2)^2) equal to -2 or 2? In an hypothesis testing procedure, if the p-value is greater than alpha, you would reject the null hypothesis. True or False? What are some other words foe stable?

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