请教一道题哈,希望能得到大家的讨论和高手的指点哈:
The recommendation site of the restriction endonuclease AvaI is CPyCGPuG, where Py is any pyrimidine and Pu is any purine. What is the expected average distance, in nucleotide pairs, between AvaI cleavage sites in a random DNA sequence?
答案是1,024. 是道标准的ETS的Sub题。
请教解释哈。
谢谢。