Each opsin molecule has multiple principal serine and threonine phosphorylation sites on its cytosol-facing C-terminal segment.

TLS Online TPP Program

#Id: 9089

#XL - T Zoology

ADP-ribosylation blocks the GTPase activity of Gαs and renders Gαs permanently active. 

TLS Online TPP Program

#Id: 10112

#XL - T Zoology

Ions, low-MW precursors of cellular macromolecules, products of intermediary metabolism, & small intracellular signaling molecules can pass from cell to cell through gap junctions.

TLS Online TPP Program

#Id: 9955

#XL - T Zoology

Subcutaneous infections are normally introduced by trauma and accompanied by inflammation; when inflammation is chronic, extensive tissue damage may ensue. 

TLS Online TPP Program

#Id: 9071

#XL - T Zoology

Feedback mechanisms suppress signaling by the PKA pathway:

1. Intrinsic GTPase activity of Gαs

2. PDE acts to hydrolyze cAMP to 5′-AMP

3. By BARK

TLS Online TPP Program

#Id: 2207

#XL - T Zoology

James Hutton and Charles Lyell- Uniformitarianism