As intermediates of the citric acid cycle are removed to serve as biosynthetic precursors, they are replenished by anaplerotic reactions

TLS Online TPP Program

#Id: 9074

#XL - T Zoology

Activation of β-adrenergic receptors causes activation of C subunits of PKA which phosphorylate PDE, stimulating its catalytic activity.

TLS Online TPP Program

#Id: 7027

#XL - T Zoology

Proximate causes - The subject of cell biology, neurobiology, and many other biological disciplines

Ultimate causes - Their historical causes, especially the action of natural selection

TLS Online TPP Program

#Id: 8852

#XL - T Zoology

Geminin contains a destruction box at its N-terminus that is recognized by APC/Ccdh1, causing it to be ubiquitinylated in late anaphase and degraded by proteasomes.

TLS Online TPP Program

#Id: 8346

#XL - Q Biochemistry

Formins are activated by membrane-bound Rho-GTP, a Ras-related small GTPase

TLS Online TPP Program

#Id: 10304

#XL - Q Biochemistry

Negative costimulation