Which of the following $RNAs$ should be most abundant in animal cell?

If the sequence of one strand of $DNA$ is written as follows:

$5'- ATGCATGCATGCATGCATGCATGCATGC-3'$

Write down the sequence of complementary strand in $5^{\prime} \rightarrow 3^{\prime}$ direction

Genes that are involved in turning on or off the transcription of a set of structural genes are called:

In split genes, the coding sequences are called

During elongation of polypeptide chain, sigma factor is

A transcription unit in $DNA$ is defined primarily by the three regions in $DNA$ and these are with respect to upstream and down stream end;