Step 1: Understanding the Question:
The question identifies a specific enzyme based on its functional nickname in molecular biology and genetic engineering. Step 2: Detailed Explanation:
In DNA replication and biotechnology, fragments of DNA need to be linked together covalently. DNA Ligase facilitates the joining of DNA strands together by catalyzing the formation of a phosphodiester bond.
- It seals the "nicks" between Okazaki fragments on the lagging strand during replication.
- In recombinant DNA technology, it "glues" the gene of interest into a vector (like a plasmid).
In contrast:
- Helicase "unzips" DNA.
- Restriction Endonuclease "cuts" DNA (molecular scissors).
- DNA Polymerase "synthesizes" new strands. Step 3: Final Answer:
The "molecular glue" is DNA Ligase.