Plasmid vectors often contain __________ genes that can be used to screen for recombinants.

Plasmid vectors often contain __________ genes that can be used to screen for recombinants.

Plasmid vectors often contain __________ genes that can be used to screen for recombinants. 









A. metabolic activation
B. antibiotic resistance
C. insertion sequence
D. promoter/operator











Answer: B