Question

What could happen if a gene does not have a promoter sequence?

Answer 1

promoters are adjacent and typecally upstream of the sense strand of the regulated gene .promoters are the vital components of expression vectors.because they control the attachment of RNA polymerase to DNA and are directly responsible for the amount of transcript generated.

this is the importance of promoter sequence.

Answer 2

Answer:

In genetics, a promoter is a sequence of DNA to which proteins bind that initiate transcription of a single RNA from the DNA downstream of it. This RNA may encode a protein, or can have a function in and of itself, such as tRNA, mRNA, or rRNA. Promoters are located near the transcription start sites of genes, upstream on the DNA (towards the 5' region of the sense strand). Promoters can be about 100–1000 base pairs long.