Some restriction enzymes cut at specific and unambiguous sequences (e. g., noti at gcggccgc). as such, the distance between two such sites in a large random dna sequence is 48, assuming a 50% g+c dna content. however, the sequence recognized by xhoii is said to be ambiguous (pu-gatc-py, where pu = any purine and py any pyrimidine). what, therefore, is the expected distance between two xhoii sites in a large random sequence?

the framers of the constitution insisted that federal judges be nominated instead of elected due to their desire to have judges above the shifting whims of the masses.

the hope, whether achieved or not, was that federal judges would only be beholden to the law and that by not having judges be elected, they would be protected if that law dictated an outcome that ran counter to popular opinion.

b tumor cells have a cell wall instead of a membrane

explanation:

tumor cells different from normal cells because tumor cells have a cell wall instead of a membrane.

the correct answer is: b. pantala flavescens, because these organisms would have a high level of genetic variation due to sexual reproduction.  

because involves two organisms (parents) whose genetic material combines, sexual reproduction leads to genetic variation in new generations of offspring. the offspring is an unique organism, with new genome, more protected with the higher ability to adapted. this process is fundamental to evolution.