The statements which are true about proteins involved in the cutting and pasting of DNA are :
1. A restriction enzyme cuts DNA while DNA ligase pastes DNA.
2. A particular restriction enzyme only cuts DNA at one very specific DNA sequence.
3. DNA ligase pastes together segments of DNA with matching sticky ends.
While DNA ligase can bind or rejoin DNA fragments with complementary ends, restriction enzymes, which are naturally present in bacteria, can cut DNA fragments at particular sequences.
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