Transmembrane domain with the binding sites for transported ligand.

TLS Online TPP Program

#Id: 3268

#Unit 3. Fundamental Processes

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: 3128

#Unit 3. Fundamental Processes

The E. coli oriC contains 11 copies of the sequence GATC/CTAG which is a target for methylation at the N6 position of adenine by the Dam methylase enzyme.

TLS Online TPP Program

#Id: 9631

#Unit 4. Cell Communication and Cell Signaling

Monomeric Ras protein 

(∼170 amino acids) belongs to the GTPase superfamily of

intracellular switch proteins

TLS Online TPP Program

#Id: 1150

#Unit 7. System Physiology – Animal

Mesangial cells are contractile and play a role in the regulation of glomerular filtration. 

TLS Online TPP Program

#Id: 8537

#Unit 2. Cellular Organization

Augmin-induced branches help build the spindle during mitosis.