In prokaryotes, the predominant site for control of gene expression is the  :

(1) transcription initiation 

(2) processing level

(3) transport of mRNA 

(4) translation level

In most prokaryotes the transcription unit is :

(1) Mono-cistronic

(2) Poly-cistronic

(3) Multi-cistronic

(4) Uni-cistronic

A transcription unit does not contain:

1. A promoter

2. The structural gene

3. A terminator

4. An operator

Consider the following statements:

I. All the reference point while defining a transcription unit is made with coding strand

II. It is the presence of a promoter in a transcription unit that also defines the template and coding strands

III. Exons are said to be sequences that do not appear in mature or processed RNA

Which of the above statements are true?

1. I and II only

2. I and III only

3. II and III only

4. I, II and III

DNA-dependent RNA polymerase catalyses transcription on one strand of the DNA which is called the 

(1) template strand

(2) coding strand

(3) alpha strand

(4) anti strand