ACTH (corticotropin) controls the secretion of cortisol by the activation of adenylyl cyclase via Galpha s.

TLS Online TPP Program

#Id: 9942

#Unit 4. Cell Communication and Cell Signaling

Diphtheria

Natural infection with C. diphtheriae occurs only in humans and is spread by respiratory droplets. 

The organism colonizes the nasopharyngeal tract and causes little tissue damage, with only a mild inflammatory reaction. 

TLS Online TPP Program

#Id: 9921

#Unit 4. Cell Communication and Cell Signaling

Cell-Mediated Immunity against Virus

Both CD8+ TC cells and CD4+ TH1 cells are required components of the cell-mediated antiviral defense.

Activated TH1 cells produce IL-2, IFN-ϒ, and tumor necrosis factor-α.

TLS Online TPP Program

#Id: 2992

#Unit 3. Fundamental Processes

DNA polymerase I has a unique 5 '-3' exonuclease activity that can be combined with DNA synthesis to perform nick translation.

TLS Online TPP Program

#Id: 6463

#Unit 3. Fundamental Processes

A regulatory site that binds more negative regulators than positive regulators to control transcription is called a silencer.

TLS Online TPP Program

#Id: 6773

#Unit 3. Fundamental Processes

The cap binding CBP20/80 complex appears to directly bind to the mRNA export machinery (the TREX complex)