This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Metabolism of nucleic acids, Subject name: Biochemistry
[{'content': 'What do restriction endonucleases do? \nSelect and explain. \nA. Cut ds DNA at specific sites, B. Cut RNA at specific sites, C. Cut ss DNA at specific sites, D. Break peptide chains', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Restiction Endonucleases (RE) : In order to transfer a gene, it is to be first selectively split from the parent DNA. It is usually achieved by the restriction endonucleases. RE have specific recognition sites where they cut the DNA. There are >800 such enzymes now available commercially. These enzyms recognize specific sequence with palindrome arrangement. REF :DM VASUDEVAN textbook; 8th EDITION; Page no :601', 'role': 'assistant'}]