【简答题】The switch network shown in Figure P1.53 represents a digital communication link. Switches , i = 1, . . . , 6, are open or closed and operate independently. The probability that a switch is closed is...
【单选题】There are at least ___ structural classes of ribozymes that engage in self-cleavage; all use general acid and base catalysis to promote the attack of a 2′-hydroxyl group on an adjacent phosphodiester ...