Which of the following statements about restriction nucleases in false?
a. a reproducible set of DNA fragments will be produced every time a restriction nuclease digest a known piece of DNA.
b. Restriction nucleases recognize specific on single-stranded DNA.
c. Some bacteria use restriction nucleases as protection from foreign DNA
d. Some bacteria nucleases cut in a staggered fashion, leaving short single-stranded regions of DNA at the ends of the cut molecule.