What are the conserved and variable regions of group I introns in Tetrahymena?
What will be an ideal response?
Ans: Group I introns have nine highly conserved regions that base pair to form secondary structures of the intron necessary for autosplicing. There is some sequence variation in these conserved regions. The length of the introns varies considerably as the conserved regions do not need to be close to the splice junctions.
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Indicate whether the statement is true or false
Which structure stores nitrogenous waste removed from a bird embryo?
1.amniotic cavity
2.allantois
3.chorion
4.yolk
Which sentence best describes the role of the signal recognition particle (SRP)?
a. It activates gene expression. b. It assists in polyadenylation of mRNA. c. It assists in mRNA splicing. d. It temporarily blocks translation.
A group is considered polyphyletic if
A. all members of the group share a common ancestor. B. it is the most parsimonious grouping. C. not all descendants of the common ancestor are included. D. the group does not contain the most recent common ancestor. E. all members share homoplastic traits.