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A protein contains a 22-residue long alpha helix. b) what is the length of this helix (in A) in the direction of the helix axis? Qué significa soñar dos soles en el firmamento, uno plateado a la derecha y el otro dorado a la izquierda? Calculus limit? Show that the sequence of real numbers {Xn} defined by X1=1 and X(n+1)=1/(3+Xn) for n=1,2,... converges and determine its limit.? Calculate the concentration of potassium ions in solution if 20.0mL of K2SO4 is mixed with 35.0mL of KCl.?