#Question id: 4510
#Unit 3. Fundamental Processes
Which statements are true about group I and group II introns,
A. Group I (and II) introns are not enzymes because they have a turnover number of only 1.
B. A third transesterification reaction can occur to cyclize the intron.
C. They cannot be readily converted into ribozymes.
D. It is similar to the way that the self-cleaving Hammerhead could be converted to a ribozyme by separating the active site from the substrate
#Question id: 4511
#Unit 3. Fundamental Processes
The proteins are not needed for the splicing reaction itself, because
#Question id: 4512
#Unit 3. Fundamental Processes
Some pre-mRNAs can be spliced in more than one way. Thus, mRNAs containing different selections of exons can be generated from a given pre-mRNA, called
#Question id: 4513
#Unit 3. Fundamental Processes
Different snRNPs recognize the same (or overlapping) sequences in the pre-mRNA at different stages of the splicing reaction, which two snRNPs recognizing the 5’ splice site
#Question id: 4514
#Unit 3. Fundamental Processes
What is true about coactivators,
A. The coactivators act directly by binding to the DNA
B. The coactivators act indirectly—not by binding to the DNA
C. Are required for essential communication between the activators and the complex composed of Pol II.
D. Are required for essential communication between the and the basal (or general) transcription factors.
#Question id: 4515
#Unit 3. Fundamental Processes
Transcription Activators are,
A. Known to facilitate transcription at hundreds of promoters,
B. Specific for a few promoters,
C. Sensitive to the binding of signal molecules,
D. Providing the capacity to activate or deactivate transcription in response to a changing cellular environment.