Describe the process of mRNA splicing
What will be an ideal response?
ANSWER: First, snRNPs bind with sequences at the intron-exon junctions. Additional snRNPs are
recruited to form a larger complex that loops out the intron and brings the exons close
together; the active spliceosome has now formed. The active spliceosome then cuts the 5¢
end of the intron, and the intron loops back to bond with itself at its 3¢ end. The spliceosome
then cuts the intron at its 3¢ end and joins together the exons that were on either side of the
intron. The intron is released and later degraded. Meanwhile, the spliceosome disassembles
as the snRNPs are released. When all introns are removed and all exons joined together, the
mRNA is finished and ready for translation.
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Which of the following is an example of a terrestrial biome?
A. littoral zone B. ocean C. lentic system D. freshwater pond E. tundra
In which of the following properties are the archaea more like eukaryotes than the bacteria?
A) size B) microtubules and microfilaments C) translation initiation D) mode of cell division E) both translation initiation and mode of cell division
Where are the proteins of the electron transport chain located?
A) mitochondrial outer membrane B) mitochondrial inner membrane C) mitochondrial intermembrane space D) mitochondrial matrix
Which of the following represents a dihybrid cross?
A) YY x pp B) YYyy x PPpp C) Yp x YY D) YP x Yp E) YyPp x YyPp