Question

Schematic structure of a transcription unit is drawn below. Identify (i), (ii) and (iii) and choose the option accordingly.
[0.7 mark]

• A.

  (i)	(ii)	(iii)
  Operator	Coding strand	Non-coding strand

• B.

  (i)	(ii)	(iii)
  Promoter	Coding strand	Template strand

• C.

  (i)	(ii)	(iii)
  Terminator	Non-template strand	Promoter

• D.

  (i)	(ii)	(iii)
  Promoter	Template strand	Coding strand

Answer 1

The correct option is D

(i)	(ii)	(iii)
Promoter	Template strand	Coding strand

The given diagram represents the schematic structure of a transcription unit. The promoter and terminator flank the structural gene in a transcription unit. From the figure, it is observed that:

(i)	(ii)	(iii)
Promoter	Template strand	Coding strand