question

(a) describe the structure of a ‘transcription unit’.

(b) explain the basis of defining the two dna strands of a structural gene in a transcription unit.

 

 

 

 

 

 

 

 

a)the transcription unit is composed of three regions that are:

 the promoter,
 structural gene and
 the terminator.

in the structural gene, there is two-strand known as the template strand and the coding strand.

b)two strands ofdna in the structural gene of a transcription unit is called a template strand as well ascoding strand.

the strand that has the polarity of 3'→5' acts as a template and is referred tothe template strand. the other strand which has the polarity of (5'→3') is referred toa coding strand.