The life span of $mRNA$ in $E. coli$ is:

$Escherichia \ coli$ is an important material for genetic experiments because

How many of the given statements $(i-iv)$ is/are correct?
$i.$ In transcription,adenosine pairs with uracil.
$ii.$ Regulation of lac operon by repressor is referred to as positive regulation.
$iii.$ The human genome has approximately $50,000$ genes.
$iv.$ Haemophilia is a sex-linked recessive disease.

In which of the following is the flow of genetic information in the reverse direction?

$DNA$ acts as a template for the synthesis of which of the following?

In a given $DNA$ segment $ATGACCAGGACCCCAACA$,the first base gets mutated. The effect of this on coding by this $DNA$ segment will result in