The number of copies of $DNA$ inserted in a host is determined by this sequence:

Genetic engineering is the

What is the fate of a piece of $DNA$ carrying only the gene of interest which is transferred into an alien organism?
$A$. The piece of $DNA$ would be able to multiply itself independently in the progeny cells of the organism.
$B$. It may get integrated into the genome of the recipient.
$C$. It may multiply and be inherited along with the host $DNA$.
$D$. The alien piece of $DNA$ is not an integral part of the chromosome.
$E$. It shows the ability to replicate.
Choose the correct answer from the options given below:

When did Cohen and Boyer complete the construction of the first $r-DNA$ by isolating an antibiotic resistance gene?

Chimeric $DNA$ is

An alien $DNA$ is linked with the origin of replication, so that this alien piece of $DNA$ can replicate and multiply itself in the host organism. This can also be called ......