The pre-miRNA liberated by Drosha is exported to the cytoplasm, where the second RNA cleavage reaction, performed by Dicer, takes place. As with Drosha, 

Dicer selects its cleavage sites using a measuring, rather than sequence-specific, mechanism.

TLS Online TPP Program

#Id: 7856

#Unit 1. Molecules and their Interaction Relevant to Biology

When equal amounts of extrorotatory and levorotatory isomers are present, the resulting mixture becomes optically inactive because the optical activities of each isomer cancel each other.

Such a mixture is called a racemic or dl-mixture or (±)-conglomerate and this process of converting an optically active compound into the racemic modification is known of racemization. 

TLS Online TPP Program

#Id: 725

#Unit 3. Fundamental Processes

The E. coli oriC contains 11 copies of the GATC sequence

TLS Online TPP Program

#Id: 2892

#Unit 3. Fundamental Processes

DnaA is an ATP-binding protein. The first stage in initiation is binding of the DnaA-ATP 

protein complex to the fully methylated oriC sequence.

TLS Online TPP Program

#Id: 2756

#Unit 13. Methods in Biology

Linkers are fused with blunt-ended DNA fragments; cleavage of the linker with the appropriate restriction enzyme creates suitable cohesive protruding ends.

TLS Online TPP Program

#Id: 3143

#Unit 7. System Physiology – Animal

Expiratory reserve volume the maximum extra volume of air that can be expired by forceful expiration after the end of a normal tidal expiration