Polymerase Chain Reaction
The cloning step in PCR/sequencing analysis of microbial communities is necessary for

separating the different rRNA gene sequences in the mixture
none of these
the amplification process
preventing contamination by outside DNA

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Polymerase Chain Reaction
The efficiency of amplification in PCR in later cycles is reduced due to

all of these
reduction in substrate concentration
insufficient enzyme and time to synthesize mass quantity of DNA
build up of PCR product which competes with primers for hybrid formation

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