What would be the first step in using pcr to copy a gene? a. various strands of dna are allowed to cool. b. copied strands are used as templates to make more copies. c. dna is heated to separate stands. d. dna polymerase adds nucleotides to separate strands.

bacteria could be both, harmful and to us. harmful bacteria could make us sick and probably even by getting the chances of getting a disease, but good bacteria fight it off with your immune system. there is always bacteria everywhere we go. we need to make sure to wash our hands after using the restroom, before eating, after eating, after petting an animal too. so you see, bacteria is everywhere and is harmful or . i hope this . : ) : ) : )