What is the role of a promoter in a cloning vector?

What is the role of a promoter in a cloning vector?

Step 1: Understand what a cloning vector is. A cloning vector is a tool used to insert a gene into a host cell.
Step 2: Learn about the role of a promoter. A promoter is a specific DNA sequence that signals where to start making RNA from a gene.
Step 3: Realize that when a gene is inserted into a cloning vector, it needs a promoter to be expressed.
Step 4: Know that the promoter helps the cell's machinery recognize the gene and begin the process of transcription, which is making RNA from the DNA.
Step 5: Conclude that without a promoter, the inserted gene would not be turned into RNA, and thus, would not be expressed.

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