Endonucleases and exonucleases are enzymes that can remove nucleotides from a polynucleotide chain.An endonuclease removes nucleotides ________ while an exonuclease removes nucleotides ________.
A) from the 5' end of the chain; from the 3' end of the chain
B) from the 3' end of the chain; from the 5' end of the chain
C) internally; from the ends of the chain
D) from the ends of the chain; internally
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