The terminator is located towards 3' end of the coding strand and it usually defines the end of the process of transcription.

During transcription, the terminator sequence is responsible for signaling the end of the transcription process. The terminator sequence is located towards the 3' end of the coding strand. It acts as a signal for the RNA polymerase to stop synthesizing the RNA transcript. The terminator sequence contains specific nucleotide sequences that are recognized by termination factors, which ultimately cause the detachment of the RNA polymerase from the DNA template. This ensures the completion of the transcription process and the release of the newly synthesized RNA molecule.

Reason: During transcription, the DNA strand which runs in 5' - 3' is called the template strand.

During transcription, the DNA molecule serves as a template for the synthesis of an RNA molecule. The DNA molecule consists of two strands: the coding strand (also known as the sense strand) and the template strand (also known as the antisense strand). The coding strand has the same sequence as the RNA transcript, except it contains thymine (T) instead of uracil (U) since DNA uses T instead of U. On the other hand, the template strand has a complementary sequence to the RNA transcript, with adenine (A) pairing with uracil (U), guanine (G) pairing with cytosine (C), and cytosine (C) pairing with guanine (G).

During transcription initiation, RNA polymerase binds to the DNA template strand at a specific region called the promoter. The RNA polymerase then moves along the template strand in the 3' to 5' direction, synthesizing the RNA transcript in the 5' to 3' direction. The template strand acts as a guide for the RNA polymerase to synthesize a complementary RNA molecule with the same sequence as the coding strand, except for the substitution of T with U.

In summary, the DNA strand that runs in the 5' to 3' direction is called the template strand during transcription because it serves as a template for the synthesis of an RNA molecule, with the RNA polymerase synthesizing the RNA transcript in the 5' to 3' direction based on the complementary base pairing between the template strand and the RNA nucleotides.