PNPase a 3’ to 5’ exonucleases in E. coli, are unable to progress through double-stranded regions. Thus, the stem-loop structure at the 3’ end of many bacterial mRNAs protects the mRNA from direct 3’ attack.

TLS Online TPP Program

#Id: 6795

#Unit 3. Fundamental Processes

First cleavage reaction in nucleus leaves a 2-nucleotide overhang on the 3’ ends of the dsRNA product. This 3’ overhang is important for recognition of that RNA molecule by the next enzyme in the cytosolic pathway, Dicer.

TLS Online TPP Program

#Id: 9503

#Unit 6. System Physiology – Plant

The ToxA gene encodes a 13‐ kDa polypeptide. ToxA stimulates host cell death in a light dependent manner by binding to Plastocynin.

TLS Online TPP Program

#Id: 6938

#Unit 8. Inheritance Biology

TLS Online TPP Program

#Id: 7128

#Unit 6. System Physiology – Plant

Strigolactone biosynthetic pathway and signaling proteins. All-trans-b-carotene is isomerized to 9-cis-b-carotene by a b-carotene isomerase. 9-cis-b-Carotene is cleaved by carotenoid cleavage dioxygenases, to produce carlactone. 

The final stages of strigolactone synthesis and signalling occur in the cytosol.

TLS Online TPP Program

#Id: 7414

#Unit 5. Developmental Biology

The homologue of β-catenin in Drosophila is Armadillo.