The centromeres of all four chromosomes of D. melanogaster aggregate to form a chromocenter that consists largely of heterochromatin.

TLS Online TPP Program

#Id: 6663

#Unit 3. Fundamental Processes

TLS Online TPP Program

#Id: 6664

#Unit 3. Fundamental Processes

Splicing is an SN2 reaction that proceeds through a pentavalent phosphorous intermediate.

TLS Online TPP Program

#Id: 6665

#Unit 3. Fundamental Processes

There are three type of Splicing Machinery

TLS Online TPP Program

#Id: 6666

#Unit 3. Fundamental Processes

TLS Online TPP Program

#Id: 6667

#Unit 3. Fundamental Processes

The group I and group II introns have the remarkable ability to excise themselves from an RNA. This is called autosplicing, or self splicing. 

Group I introns are more common than group II introns.

TLS Online TPP Program

#Id: 6668

#Unit 3. Fundamental Processes

Two transesterification reactions takes place for 2 exon -1 intron configuration. First transesterification is catalysed variably either by external G or branch point while second transesterification is always caused by exon 1 -3’OH.