Concept:Restriction endonucleases are bacterial enzymes that cut DNA at specific sequences, protecting against bacteriophages.
Key Fact:These enzymes recognise and cut DNA within palindromic sequences, often slightly away from the centre, and do not remove nucleotides from ends.
Explanation:Statement C is false because restriction endonucleases usually cut DNA a few bases away from the centre of the palindromic site, not exactly at the centre.
Statement D is false because removal of nucleotides from ends is performed by exonucleases, not by restriction endonucleases.
Statements A, B, and E are correct: they are called molecular scissors, they restrict bacteriophage growth in E. coli, and they recognise specific palindromic base-pair sequences.
Answer:Option D (C and D only).
