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
True about Restriction enzyme 
Select and explain. 
A. Palindromic, B. Produce DNA sticky end, C. Restict replication of DNA, D. Restriction sites are not specific
A: Palindromic
Answer: A: Palindromic 
Explanation: Restriction enzyme or restriction endonuclease is an enzyme that cuts DNA at or near specific recognition nucleotide sequences known as restriction sites.Recognising a palindromic sequence enables them to cut both strands of DNA at the "same" site because the strand will have the same sequence only in different directions at that site.