The lac operon has three paradoxes

if the operon is in a repressed state, how does the inducer enter the cell to start the process of induction

 If the operon is in a repressed state, how Repressor is removed with allolactose 

 How is allolactose synthesized in Repressed state Answer is Leaky Expression

TLS Online TPP Program

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#Unit 3. Fundamental Processes

Lariat formation is characterize by 2’-5’ phosphodiester bond

TLS Online TPP Program

#Id: 2324

#Unit 3. Fundamental Processes

Group II mitochondrial introns are excised by the same mechanism as nuclear pre-mRNAs via a lariat that is held together by a 2’–5’ bond.

TLS Online TPP Program

#Id: 2325

#Unit 3. Fundamental Processes

SR proteins are involved in exon definition in which they interact with U1 and U2AF forming commitment E complex.

 

TLS Online TPP Program

#Id: 2326

#Unit 3. Fundamental Processes

U11 base pairs with the 5’ splice sites; U12 base pairs with the branch point sequence near the 3’ splice site; and U4atac and U6atac provide analogous functions during the spliceosome assembly and activation of the spliceosome. 

U5 is same component in all splicing complexes

TLS Online TPP Program

#Id: 2327

#Unit 3. Fundamental Processes

Each snRNP contains a single snRNA (100-300 nt) and several (20) proteins. The U4 and U6 snRNPs are usually found together as a di-snRNP (U4/U6) particle.

TLS Online TPP Program

#Id: 2328

#Unit 3. Fundamental Processes

U1 snRNA consist of four hairpins, one intron pairing strands and one sm binding domains.