#Question id: 2700
#Unit 2. Cellular Organization
What is the minimum number of bases required for loop stability?
#Question id: 31063
#Unit 2. Cellular Organization
#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: 4469
#Unit 3. Fundamental Processes
Termination is a normal and important function at the ends of genes. There, sequences called terminators trigger the elongating polymerase to dissociate from the DNA and release the RNA chain it has made, In bacteria, terminators come in two types: Rho-dependent and Rho-independent, choose correct statements about this;
Rho-dependent |
a- rut sites |
b- has an ATPase activity |
|
Rho-independent |
c- terminates only those transcripts still being transcribed beyond the end of a gene or operon |
d- intrinsic terminator |
#Question id: 4923
#Unit 8. Inheritance Biology
following statement given for Genetic maternal effect are correct?
A- Characteristics are determined by nuclear gene
B- Inherited according to Mendel’s principles
C- In F3 generation, segregation of Dominant trait and recessive trait in ratio of 3:1
D) No Segregation of Trait in F2 generation