Removal of which chain results in maturation of proinsulin to insulin?
$D$ chain
$C$ chain
$B$ chain
$A$ chain
Gene therapy in humans was first practiced by Blease and Andresco to cure
Streptomyces fradiae produces
Read the following four statements $(1-4)$ about certain mistakes in two of them
$1.$ The first transgenic buffalo, Rosie produced milk which was human alphalactal albumin enriched.
$2.$ Restriction enzymes are used in isolation of $DNA$ from other macro-molecules.
$3.$ Downstream processing is one of the steps of $R-DNA$ technology.
$4.$ Disarmed pathogen vectors are also used in transfer of $R-DNA$ into the host.
Which are the two statements having mistakes?
Which one of the following vectors is used to replace the defective gene in gene therapy ?