Haldane’s rule: hybrid sterility or hybrid inviability is often limited to the heterogametic sex. 

TLS Online TPP Program

#Id: 7313

#Unit 12. Applied Biology

In the absence of Hg2+, MerR functions as a repressor and binds to the operator region of the mer operon, thus preventing transcription of the structural genes.

TLS Online TPP Program

#Id: 7140

#Unit 6. System Physiology – Plant

Active brassinosteroids are also regulated by brassinosteroid-dependent negative feedback mechanisms attenuation which is brought about by the downregulation of brassinosteroid biosynthetic genes and the upregulation of genes involved in brassinosteroid catabolism.

TLS Online TPP Program

#Id: 2360

#Unit 5. Developmental Biology

Second possible mechanisms for neoblast specification during regeneration:

Multipotent progenitor cells are positioned throughout the planarian with their lineages specified based on their position. These divide and produce postmitotic blastema cells that differentiate into their specified fates.

 

TLS Online TPP Program

#Id: 3645

#Unit 3. Fundamental Processes

Several Class II enzymes do not interact with their bound tRNA’s anticodon.

TLS Online TPP Program

#Id: 8289

#Unit 1. Molecules and their Interaction Relevant to Biology

Plot of ln k versus 1/T gives a straight line with a slope (m) of –Ea/R and an intercept (b) of ln A.