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
C. internally; from the ends of the chain
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