Why both the strands of DNA are not copied during transcription because

(1)RNA molecules with different sequences will be produced and hence proteins with different sequences will be produced.

(2)double stranded RNA molecules will be produced that would prevent translation of dsRNA

(3)cell will fail to produce proteins as no single stranded RNA is present

(4) All of the above

 Which of the following is not a unit of transcription unit

(1)A promoter

(2)The structural gene

(3)A terminator

(4)A operator

The direction of transcription is

(1)always from 5’ to 3’

(2)always from 3’ to 5’

(3)depends on the template direction

(4)sometimes 5’ to 3’ and sometimes 3’ to 5’

The strand of DNA which does not code for anything is referred to as

(1)anti-sense strand

(2)coding strand

(3)non-coding strand

(4)template strand

which of the following is true for coding strand

(1) it’s known as template strand

(2)it’s polarity is 5’ to 3’

(3)it’s a sense strand

(4)Both b and c

Which of the following is true for promoter and terminator of a transcription unit?

(1)Both flank the structural gene

(2)promoter is upstream of the structural gene with respect to coding strand polarity

(3)terminator is downstream of the structural gene with respect to coding strand polarity

(4)all of the above

Template and coding strands are defined by the presence of

(1)terminator

(2)structural gene

(3)promoter

(4)all of these

In transcription unit regulatory sequences are present

(1)always at the upstream of the promoter

(2) always at the downstream of the promoter

(3)may be present further upstream or downstream to the promoter

(4)before the structural gene and after the promoter

Which of the following is incorrect for a gene?

(1)functional unit of inheritance

(2)sequence of DNA which codes for a protein only

(3)monocistronic or polycistronic

(4)DNA sequence coding for tRNA or rRNA molecule

Which of the following is a false statement?

(1) structural gene in transcription unit could be polycistronic in eukaryotes

(2) structural gene in transcription unit could be polycistronic in prokaryotes

(3) structural gene in transcription unit could be monocistronic in eukaryotes

(4) None of these