Final answer:
In transcription, a gene is a segment of DNA that carries the information to produce a protein. The promoter is located at the beginning of the gene and acts as a binding site for RNA polymerase. A transcriptional unit includes the promoter, gene sequence, and termination site.
Step-by-step explanation:
In transcription, a gene refers to a segment of DNA that contains the information to produce a specific protein or RNA molecule. The location of the promoter is at the beginning of the gene, acting as a binding site for RNA polymerase. It helps initiate the transcription process by positioning the enzyme near the transcription start site. The function of the promoter is to regulate gene expression by controlling the rate of transcription.
A transcriptional unit refers to the specific region of DNA that is transcribed into RNA. It includes the promoter, the gene sequence, and the termination site. It represents the entire unit involved in the transcription process.