When a typical restriction enzyme cuts a DNA moleule, the cuts are uneven so that the DNA fragments have single-stranded ends . These ends are useful in recombinant DNA work because :
A. they serve as starting points for DNA replication
B. only single stranded DNA segments can code for proteins
C. they enable researchers to use the fragments as molcular probes
D. the fragments will bond to other fragments with complementary ends.
