Restriction endonucleases are utilized in genetic engineering techniques as

Question

$\begin{array}{1 1} (a)\;\text{ Molecular cement for combining DNA bits into long chains.} \\ (b)\;\text{Molecular scalpels for cutting DNA at specific sites.} \\(c)\; \text{ Molecular scalpels for cutting DNA break up.} \\ (d)\; \text{ Molecular cement that build up nucleotides in tandem.} \end{array} $