In lac operon, the lac $mRNA$
Has several initiation and termination codons
Forms four different enzymes
Is not transcribed in the presence of lactose
Is involved in an anabolic reaction
Genes express their character by forming
Genes located at the same locus of chromosomes are called
Removal of introns and joining of exons in a defined order during transcription is called
Gene library or $DNA$ library has collection of