The loop region of the beacon is designed to bind specifically to a target nucleic acid. Thus, in the presence of the target nucleic acid, the stem region of the beacon becomes separated, releasing the fluorophore from the quencher such that active fluorescence can be observed.

TLS Online TPP Program

#Id: 9811

#Unit 6. System Physiology – Plant

A toggle model is for phytochrome interconversion

The structure of the b-hairpin region of Pr is changed to an a helix during the conversion of Pr to Pfr, which initiates other conformational changes in the protein.

TLS Online TPP Program

#Id: 4647

#Unit 13. Methods in Biology

The more metabolically active cells that are present in the culture, the more formazan will be generated, and so this assay provides a readout of the number of live cells as a function of time

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#Id: 5732

#Unit 10. Ecological Principles

Biotic Theory

a. Competition

b. Parasitism

c. Predation 

TLS Online TPP Program

#Id: 10270

#Unit 6. System Physiology – Plant

The stomatal response to blue light is rapid and reversible, and it is localized in a single cell type, the guard cell

TLS Online TPP Program

#Id: 3811

#Unit 5. Developmental Biology

Chemotaxis of Dictyostelium myxamoebae is a result of spiral waves of cAMP.