#Question id: 4548
#Unit 3. Fundamental Processes
σ- subunit of prokaryotic RNA polymerase describing is incorrect
#Question id: 4549
#Unit 3. Fundamental Processes
Which of the following is the correct combination?
I) A- Holoenzyme, B- Core
II) A- Core, B- Holoenzyme
i. The six subunits constitute the RNA polymerase an enzyme
ii. Sigma stimulates tight binding between RNA polymerase and promote
iii. absence of sigma factor polymerase loosely bind with their promoter
Which of the following combination correct fit by follow the given graph;
#Question id: 4550
#Unit 3. Fundamental Processes
Which one of the following factor of Holoenzyme assists the RNA polymerase in separating the DNA strands at the transcription start site?
#Question id: 4551
#Unit 3. Fundamental Processes
Various types of σ factor in column I, that are involved in several other function given in column II
|
I |
II |
|
I) σ70 |
a) Induced by unfolded proteins in the cytoplasm contain chaperones activity which refold unfolded proteins |
|
II) σs |
b) Genes involved in flagellum assembly |
|
III) σ32 |
c) Genes for nitrogen metabolism and other functions |
|
IV) σE |
d) Housekeeping genes, most genes in exponentially replicating cells |
|
V) σF |
e) Activated by unfolded proteins in the periplasmic space and cell membrane; genes encoding proteins that restore integrity to the cellular envelope |
|
VI) σ54 |
f) Stationary-phase genes and general stress response |
Which of the following combination is correct?
#Question id: 4552
#Unit 3. Fundamental Processes
The sequence of σ54 is distinctly different from that of all the σ70-like factors, some characteristics about σ54 is given below;
a) The σ54-RNA polymerase binds to the glnA promoter and immediately melt the DNA strands and initiate transcription
b) σ54-polymerase does not require ATP hydrolysis to separate the strands at a start site only require activator such as NtrC
c) σ54-RNA polymerase initiate transcription of glnA promoter only when it is activated by NtrC
d) ATP hydrolysis is required for activation of bound σ54-RNA polymerase by phosphorylated NtrC
Which of the following from the bove combination is INCORRECT?
#Question id: 4553
#Unit 3. Fundamental Processes
The NtrC protein (nitrogen regulatory protein C)—stimulates transcription of the glnA gene, this protein is an activator of σ54-RNA polymerase. Which of the following given characteristics about this protein is incorrect?