A bacteria contains two copies of the lac operon; one on the bacterial chromosome and one on a plasmid. The lacO site on the chromosomal lac operon is mutated and non-functional whereas the lacO site on the plasmid is functional. What is the most likely outcome for the bacterial cell when glucose is declining and lactose is present?
A. Expression of lac structural genes on the chromosome and plasmid will decrease because two copies of the lacO site are needed for repression of the lac operon.
B. Expression of lac structural genes on the chromosome and the plasmid will increase because more repression of the lac operon occurs as glucose decreases.
C. Expression of lac structural genes on the chromosome and plasmid will increase because the lacO site does not affect the CAP protein that activates the operon.
D. Expression of lac structural genes will not change because the lacO site is not involved in repression of the lac operon.
C. Expression of lac structural genes on the chromosome and plasmid will increase because the lacO site does not affect the CAP protein that activates the operon.
You might also like to view...
The length of the lag phase of growth can vary depending on
A. the nature of the growth medium. B. the temperature. C. the condition of the microorganisms. D. All of the choices are correct.
Phagocytes interact speedily and effectively with pathogens because they have evolved specialized molecules called pattern recognition receptors (PRRs) that interact directly with PAMPs
Indicate whether the statement is true or false.
A structure composed of nervous tissue along with other tissues that enhance its response to a certain type of stimulus is called a(n) __________.
a) sense organ b) receptor c) transducer d) initiator e) activator
This image depicts the concept of
1.osmosis
2.diffusion
3.active transport
4.facilitated transport