DNA is very small, one complete turn of a DNA helix is about .

Explanation:

DNA is very small, one complete turn of a DNA helix is about ___3.4 nm___.

c.) polymerase chain reaction

- "unlike the original dna fingerprinting method, dna profiling does not use restriction enzymes to cut the dna. instead it uses the polymerase chain reaction (pcr)? to produce many copies of specific str sequences. pcr is an automated procedure that generates lots of copies of a specific sequence of dna."

just here for the other one bc they put up with u