Question

Choose the correct answer from the alternatives given :
Given diagram represents the components of a transcription unit. Select the correct answer regarding it.

• A. A Terminator, B Promoter, C - Template strand, D - Coding strand
• B. A Promoter, B Terminator, C - Coding strand, D - Template strand
• C. A Promoter, B Terminator, C - Template strand, D - Coding strand
• D. A Terminator, B Promoter, C - Coding strand, D - Template strand

Answer 1

The correct option is C A Promoter, B Terminator, C - Template strand, D - Coding strand

The segment of DNA that takes part in transcription is called transcription unit. It has three components A. a promoter, B. the structural gene and C. terminator D.Besides a promoter, eukaryotes also require an enhancer. A promoter is located upstream of structural gene. It is called 5 end of coding strand which is 3 end of template strand.

Terminator region is present downstream of structural gene at the 3 end of,coding strand which is actually 5 end of the template strand. Promoter has different parts for attachment to various transcription factors. In many cases, the promoter has an AT rich region called TATA box. The area has a groove to which specific protein components can combine. TATA containing region is also called Pribnow box.

So, the correct answer is 'A Promoter, B Terminator, C - Template strand, D - Coding strand'.