Question

In naturally occurring bacterial systems, tetracycline binding repressor protein binds in the _____ of tetracycline to the control sequence and _______ transcription.

(a) presence, activates

(b) absence, activates

(c) absence, inactivates

(d) presence, inactivates

This question was addressed to me by my school teacher while I was bunking the class.

My query is from Cultured Cells in Mammals and Restricted Areas in Intact Organisms in section Using Other Organisms of Genetic Engineering

Answer 1

Right option is (c) absence, inactivates

Best explanation: In naturally occurring bacterial systems, tetracycline binding repressor protein binds in the absence of tetracycline to the control sequence tet0 and inactivates transcription.