Why is the hiv virus so detrimental?

Because it slowly attacks the immune system until it can no longer work properly. By that point the body will not longer be able to correctly defend itself from sicnesses and cancers. I did not Google the answer, all of this is from my head. Hope I helped!

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."