BIOL 200 Lecture Notes - Lecture 35: Prokaryotic Small Ribosomal Subunit, Methionine, Nucleoplasm
Document Summary
Rnas can carry out catalysis on their own (cid:120) carry out trans-esterification reactions independently from protein (cid:120) proteins may have been a later addition to rnas in evolutionary time. Rgg repeats: confer some ability to bind to rna. Alternative splicing controls sex determination in drosophila (cid:120) mixing and matching of exons (cid:120) clear differences between male and female flies (cid:120) there is clear sexual dimorphism which is a reflection of the chromosome content = dosage compensation. It makes changes by interacting with specific regions of pre-mrnas. Later in development, the female-specific promoter is repressed and a different sxl promoter is activated that is on in both sexes (cid:120) however, sxl pre-mrna is alternatively spliced dependent upon the presence of sxl protein. In a male, a different male-specific sexual dimorphic repertoire is activate: end up differentiating male flies from female flies.
