Input of energy in the form of ATP is required at several stages for the prepriming reaction, and it is required for unwinding DNA.

TLS Online TPP Program

#Id: 9706

#Unit 4. Cell Communication and Cell Signaling

Ligand binding to either of the two yeast pheromone GPCRs triggers the exchange of GTP for GDP on the Gα subunit and dissociation of Gα∙GTP from the Gβγ complex.

TLS Online TPP Program

#Id: 10018

#Unit 4. Cell Communication and Cell Signaling

The phosphorylated Ci is proteolytically cleaved by the ubiquitin-proteasome pathway, generating an N-terminal fragment Ci75, which functions as a transcriptional repressor of Hh target genes.

TLS Online TPP Program

#Id: 9638

#Unit 4. Cell Communication and Cell Signaling

Sos is a GEF that catalyzes conversion of inactive GDP bound Ras to the active GTP-bound form.

TLS Online TPP Program

#Id: 2175

#Unit 11. Evolution and Behavior

Selection coefficients-  The allelic frequency at equilibrium (qˆ) depends on the relative fitnesses of the two homozygotes:

TLS Online TPP Program

#Id: 9267

#Unit 6. System Physiology – Plant

Diazotrophs are able to catalyze the enzymatic reduction of this compound to ammonia (NH3) using the enzyme nitrogenase