Phosphorylation leads to a conformational change in the activation loop that unblocks kinase active site by reducing the Kd for ATP or the substrate to be phosphorylated.

TLS Online TPP Program

#Id: 8098

#XL - Q Biochemistry

The surfaces of the cells that form the alveoli (small air spaces of the lung) are coated with surfactant, which decreases the alveolar surface tension. 

Lung surfactant contains 80 to 90% phospholipid by weight, and 70 to 80% of the phospholipid is phosphatidylcholine, mostly the dipalmitoyl species.

TLS Online TPP Program

#Id: 2169

#XL - T Zoology

Average fitness

In a species, only 1 of every 1000 seeds survives to reproductive age, and that those that survive produce an average of 3000 seeds.

TLS Online TPP Program

#Id: 9632

#XL - T Zoology

Ras has an intrinsically slower rate of GTP hydrolysis, so Ras∙GTP requires the assistance of another protein, GAP.

TLS Online TPP Program

#Id: 10090

#XL - T Zoology

Integrins can mediate outside-in and inside-out signaling

TLS Online TPP Program

#Id: 9628

#XL - T Zoology

c-Cbl 

adds a single ubiquitin to a given lysine of a protein