The Ames test uses a strain of S. typhimurium that is mutant for the operon responsible for the biosynthesis of the amino acid histidine. For example, the mutant operon might contain a missense or a frameshift mutation in one of the genes for histidine biosynthesis.

TLS Online TPP Program

#Id: 3060

#Unit 10. Ecological Principles

z values are often taken to represent the slope of the relationship between species richness and area.

TLS Online TPP Program

#Id: 5089

#Unit 6. System Physiology – Plant

phyA is rapidly degraded following its activation by light. Thus, protein degradation, in addition to phosphorylation, is emerging as a ubiquitous mechanism regulating many cellular processes, including light and hormone signaling, circadian rhythms, and flowering time.

TLS Online TPP Program

#Id: 759

#Unit 3. Fundamental Processes

Four Steps for bacterial transcription

1. Promoter search->closed promoter complex -> open promoter complex

2. Abortive transcription->Promoter Escape->Initiation from +1 TSS 

3. Elongation

4. Termination

TLS Online TPP Program

#Id: 1352

#Unit 4. Cell Communication and Cell Signaling

GRB2 SH3 domains bind to proline-rich sequences in Sos

  

TLS Online TPP Program

#Id: 5041

#Unit 3. Fundamental Processes

oriC also contains 11 GATC/CTAG repeats that are methylated on adenine on both strands.