#Question id: 4682
#Unit 3. Fundamental Processes
what will happen, when repressor bound at OR1 and OR2,
#Question id: 4683
#Unit 3. Fundamental Processes
A very unstable protein in E. coli; it is degraded by a specific protease called FtsH (HflB), encoded by the hfl gene.
#Question id: 4684
#Unit 3. Fundamental Processes
The depicted region contains two genes (cI and cro) and three promoters (PR, PL, and PRM), these promoters are direct the transcription such as;
a) PR and PL are is a weak promoter and only directs efficient transcription when an activator is bound just upstream
b) PR and PL are strong, constitutive promoters, they bind RNA polymerase efficiently and direct transcription without help from an activator
c) PRM, is a weak promoter and only directs efficient transcription when an activator is bound just upstream
d) PRM are strong, constitutive promoters, they bind RNA polymerase efficiently and direct transcription without help from an activator
Which of the following from the above combination is correct ?
#Question id: 4685
#Unit 3. Fundamental Processes
Some given characteristics of repressor such as;
I) λ-repressor and
II) cro-repressor
a) A repressor binds DNA as a dimer
b) A repressor work as both activator and repressor
c) Repressor is a single-domain protein
d) Repressor binds to operator sites cooperatively
e) Only represses transcription, like the Lac repressor
which of the following are correct match statements of given repressor
#Question id: 4686
#Unit 3. Fundamental Processes
Bacteriophage λ, has two mode of life cycle; lytic and lysogenic. In the lytic growth
a) a single Cro dimer is bound to OR3; this site overlaps PRM and so Cro represses that promoter
b) Repressor bound at OR1 and OR2 blocks RNA polymerase binding at PR, repressing transcription from that promoter
c) PR and PL binds RNA polymerase and directs transcription of lytic genes
d) During lytic, PRM is on while PR (and PL) are off
Find the correct combinations of lytic growth.
#Question id: 4687
#Unit 3. Fundamental Processes
Multiplicity of infection (moi) is a measure of how many phage particles infect a given bacterial cell within a population?
a) If the average number is one or fewer phage particles per cell, the infection is more likely to result in lysis
b) If the number of phage particles is two or more, it is more likely to produce lysis
c) If the average number is one or fewer phage particles per cell, the infection is more likely to result in lysogney
d) If the number of phage particles is two or more, it is more likely to produce lysogney
which of the following is the correct prediction of moi measurement?