Answer:
breakdown of a substance by bacteria, yeasts, or other microorganisms
Explanation:
Enzyme responsible for replacing RNA primers with DNA is a type of: DNA ligase. The enzyme responsible for proofreading a growing DNA strand and for replacing mismatched nucleotides is:helicase.
Muscle cells extended called nervous muscle fibre tissue unit of muscle fiber
Scientists who do this are doing what is considered to be and called cloning. Cloning is exactly this - taking cells from one organism and trying to produce and recreate an identical (from a genetic perspective) organism.
This can be done in a routinely fashion but there are serious ethical considerations nowadays.