Question

The process of copying the genetic information from one strand of DNA into RNA is termed as transcription. The principle of complementarity of bases governs the process of transcription, also except that uracil comes in place of thymine. Study the complete transcription unit given below and answer the following questions:

Describe the location of (C) and (D) in the transcription unit.

Hint:

RNA polymerase synthesizes the RNA strand using the template DNA strand, creating a complementary sequence that mirrors the coding strand (with uracil replacing thymine).

Answer 1

Identification of (C) and (D) within a Transcription Unit

(C) signifies the Promoter

(D) signifies the Terminator

1. Promoter (C) Position:

• The promoter resides at the 5′ extremity of the DNA's coding strand.
• It is situated before the transcription initiation point.
• This is the specific area where RNA polymerase attaches to commence transcription.

2. Terminator (D) Position:

• The terminator is found at the 3′ extremity of the DNA's coding strand.
• It is located after the transcribed gene sequence.
• This location signals the cessation of transcription, leading to RNA polymerase detachment.

Synopsis:

Within a transcription unit:

• The Promoter (C) designates the commencement point for transcription.
• The Terminator (D) designates the termination point for transcription.

These regulatory elements guarantee that the designated gene segment is accurately transcribed into RNA.