In the α helix, the backbone hydrogen bonds are arranged such that the peptide CO bond of the nth residue points along the helix axis toward the peptide NH group of the (n + 4)th residue. 

TLS Online TPP Program

#Id: 6799

#Unit 3. Fundamental Processes

The action of Dicer generates the short RNA molecule that will determine what target RNA is acted upon. The active form of the regulatory RNA is the single-strand form—at this stage called the guide RNA—incorporated into a RISC protein complex.

TLS Online TPP Program

#Id: 3686

#Unit 2. Cellular Organization

Pathogenicity islands are a characteristic feature of pathogenic bacteria genomes.These are large regions (10 to 200 kb) that are present in the genomes of pathogenic species but absent from the genomes of nonpathogenic variants of the same or related species. 

TLS Online TPP Program

#Id: 1692

#Unit 4. Cell Communication and Cell Signaling

Recognition of Recombination Signal Sequence (RSS) by the RAG1/RAG2 enzyme complex.

TLS Online TPP Program

#Id: 2416

#Unit 3. Fundamental Processes

Model of Intrinsic Termination

TLS Online TPP Program

#Id: 8389

#Unit 2. Cellular Organization

Smooth muscle contraction is regulated by the cycling of myosin II between on and off states.