Which of the following statements are correct regarding restriction enzymes? A. HindII always cuts DNA molecules at a particular point by recognising a specific sequence of six base pairs. B. Exonucleases make cuts at specific positions within the DNA. C. Restriction endonucleases cut the sugar-phosphate backbones of both strands of the double helix. D. In their nomenclature, the first letter of the name comes from t

Step-by-step solution

Statement A is correct. HindII always cuts DNA molecules at a particular point by recognising a specific sequence of six base pairs. Statement B is incorrect. Exonucleases remove nucleotides from the ends of the DNA, whereas endonucleases make cuts at specific positions within the DNA. Statement C is correct. Restriction endonucleases bind to the DNA and cut each of the two strands of the double helix at specific points in their sugar-phosphate backbones. Statement D is incorrect. In the nomenclature of restriction