Formaldehyde a common fixative, crosslinks amino groups on adjacent molecules

TLS Online TPP Program

#Id: 10009

#Unit 4. Cell Communication and Cell Signaling

Secretion requires the addition of cholesterol and palmitic acid to the Hedgehog protein

TLS Online TPP Program

#Id: 7352

#Unit 11. Evolution and Behavior

Mutation

Mutation has changed the allelic frequency. it increases genetic variation within populations and between population.

TLS Online TPP Program

#Id: 2593

#Unit 13. Methods in Biology

In case of hotstart PCR, After the reaction mixture is prepared, primers can pair to the single-stranded regions in a nonspecific manner. 

A more attractive alternative is to cover the reaction mixture with a plug of inert wax and place the critical reagent on top of this plug. 

TLS Online TPP Program

#Id: 1297

#Unit 2. Cellular Organization

Four classes of ATP-powered pumps:

P-class pumps

V-class pumps

F-class pumps

ABC Superfamily

TLS Online TPP Program

#Id: 6479

#Unit 3. Fundamental Processes

Constitutive active housekeeping genes and developmentally regulated genes have TATA-less promoters