Endonucleases and exonucleases are enzymes that can remove nucleotides from a polynucleotide chain. Where do endonucleases and exonucleases remove nucleotides from?
A. An endonuclease removes nucleotides internally; an exonuclease removes nucleotides from the ends of the chain.
B. An endonuclease removes nucleotides from the 5' end of the chain; an exonuclease removes nucleotides from the 3' end of the chain.
C. An endonuclease removes nucleotides from the 3' end of the chain; an exonuclease removes nucleotides from the 5' end of the chain.
D. An endonuclease removes nucleotides from the ends of the chain; an exonuclease removes nucleotides internally.
Answer: A
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