#Question id: 24216
#Unit 1. Molecules and their Interaction Relevant to Biology
#Question id: 3851
#Unit 3. Fundamental Processes
Transcription is initiated at sites called:
#Question id: 9160
#Unit 9. Diversity of Life Forms
Generally speaking, deserts are located in places where air masses are usually ________.
#Question id: 11415
#Unit 10. Ecological Principles
Below is a list of various bird groups, with their typical age at maturity (in years). Which of these would you expect to have the greatest annual survival?
#Question id: 4114
#Unit 3. Fundamental Processes
Splice-site recognition is prone to two kinds of errors. First, splice sites can be skipped, with components bound at, for example, a given 5’ splice site pairing with those at a 3’ site beyond the correct one. Ways in which the accuracy of splice-site selection can be enhanced are as
A. The factors that recognize that site are transferred from the polymerase carboxy-terminal “tail” onto the RNA. Once in place, the 5’ splice site components are poised to interact with those other factors that bind to the next 3’ splice site to be synthesized.
B. SR (serine–arginine-rich) proteins bind to sequences called exonic splicing enhancers (ESEs) within the exons. SR proteins bound to these sites recruit the splicing machinery to the nearby splice sites to ensure correct splicing
C. By recruiting splicing factors to each side of a given exon, this process encourages the so-called “exon definition, contribute to correct splicing
D. Alternative splicing is intentional missplicing mechanism
Which of the following is INCORRECT?