#Question id: 18656
#Unit 13. Methods in Biology
#Question id: 4414
#Unit 3. Fundamental Processes
The helicase of TFIIH hydrolyzes the β-γ bond of ATP to catalyze open complex formation at Pol II promoters. ATP hydrolysis is also required by a step subsequent to transcription initiation, most likely promoter clearance. Transcriptional activation by TFIIH was assayed on linear and circular templates either in the presence of ATP and GTP or the nonhydrolyzable nucleotide analogs AMP-PNP and GMP-PNP with RNA Polymerase I. The following results were obtained. Choose plausible explanation for these results.
A. ATP is required under conditions where TFIIH is indispensable for initiation. These conditions include transcription from promoters containing a short stretch of mismatched base pairs surrounding the transcriptional start site as well as on negatively supercoiled templates.
B. As Pol I transcription on linear templates requires neither ATP hydrolysis nor protein phosphorylation
C. in contrast to Pol II, the topology of the template does not affect the requirement for TFIIH and neither the ATPase, helicase, nor protein kinase activity of TFIIH are required for Pol I transcription activation.
#Question id: 5054
#Unit 5. Developmental Biology
when one group of cells changing the behavior of an adjacent set of cells, thereby causing them to change their shape, mitotic rate, or cell fate. This kind of interaction at close range between two or more cells or tissues of different histories and properties is called as-
#Question id: 19827
#Unit 12. Applied Biology
What kind of molecules is
Phytoalexins
1. Low
molecular weight antibiotic
2. High molecular weight antibiotic
3. Polyphenolic
4. Terpenoid compounds
Which of the following is a correct option?
#Question id: 10696
#Unit 10. Ecological Principles
In a new area two species A and B was discovered and taking energy from another species X and Y respectively. Following some is life history trait of species.
I- A species is often larger than X
II- Each A species taking energy from many X
III- One Y usually supports populations of B species
IV- Fatality of Y is Mild to severe
Which of the following is correct observation of above species?