In E. coli, an isomer of lactose binds with the lactose operon:
a. repressor, preventing it from binding to the operator. This allows the lacZ and lacY genes to be transcribed.
b. operator, preventing it from binding to the repressor. This allows the lacZ and lacY genes to be transcribed.
c. repressor, helping it bind to the operator. This prevents the lacZ and lacY genes from being transcribed.
d. operator, preventing RNA polymerase from being recruited. This prevents the lacZ and lacY genes from being transcribed.
e. operator, recruiting RNA polymerase. This allows the lacZ and lacY genes to be transcribed.
Ans: a. repressor, preventing it from binding to the operator. This allows the lacZ and lacY genes to be transcribed.
You might also like to view...
Entomopathogenic nematodes can kill insects because of their symbiosis with
a. fungi. b. protozoa. c. bacteria. d. all of the above.
Which yellow-pigmented organism exhibits gliding motility that grows best at 35°C and in conditions with increased carbon dioxide (CO2) but cannot grow in ambient air?
a. Actinobacillus b. Capnocytophaga c. Cardiobacterium d. Kingella
_____ different codons constitute the genetic code
a. 3 b. 20 c. 64 d. 120
The chorionic villi eventually form the placenta, a disc-shaped structure that ____
a. releases sex hormones at appropriate times throughout pregnancy b. initiates uterine contractions c. binds to the zygote to accelerate organ development d. nourishes the embryo throughout pregnancy e. prevents infection by blocking the passage of microorganisms through the cervix during pregnancy