19. The recognition site of the restriction endonuclease Aval is CPyCGPUG, where Py is any pyrimidine and Pu is any purine. What is the expected average distance, in nucleotide pairs, between Aval cleavage sites in a random DNA sequence?
(A) 4,096
(B) 1,024
(C) 682
(D) 64
(E) 6

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