TLS Online TPP Program

#Id: 6419

#Unit 2. Cellular Organization

When arabinose is present, AraC binds that sugar and adopts a configuration that allows it to bind DNA as a dimer to the adjacent half-sites, araI1 and araI2). 

Just upstream of these is a CAP site: in the absence of glucose, CAP binds here and helps activation.

In the absence of arabinose, the araBAD genes are not expressed. This is because when not bound to arabinose, AraC adopts a different conformation and binds DNA in a different way: one monomer still binds the araI1 site, but the other monomer binds a distant half-site called araO2.

TLS Online TPP Program

#Id: 3076

#Unit 3. Fundamental Processes

The division of a bacterium into two daughter cells is accomplished by the formation of a septum.

TLS Online TPP Program

#Id: 2615

#Unit 13. Methods in Biology

In plants, the perfect complementarity between most miRNAs and their targets enables the accurate predictions of their targets, while slicing of the targeted mRNAs facilitates target validation through RNA Ligase-Mediated (RLM)-Rapid Amplification of cDNA Ends (RACE) method.

TLS Online TPP Program

#Id: 6950

#Unit 8. Inheritance Biology

Recombinant chromosomes have too many copies of some genes and no copies of others, so gametes that receive the recombinant chromosomes cannot produce viable progeny. 

TLS Online TPP Program

#Id: 8997

#Unit 6. System Physiology – Plant

Carboxylation is catalyzed by