A proposed mechanism for how Mediator regulates the amplitude (strength) of transcription is based on different conformational states. These, in turn, provide different degrees of efficiency for the re-entry of RNA pol II into PIC during re-initiation. According to this hypothetical model, what is postulated to determine the conformational shape of the Mediator?

In thos case, different conformational states may trigger the activation of the protein function. Generally, these conformational states are the result of posttranslational modifications such as, for example, protein phosphorylation  

Explanation:

In eukaryotes, the mediator complex acts to regulate the transcriptional activity. This complex interacts with the RNA polymerase II and  transcriptional factors in order to activate transcription

answers are:

lysogenic     viral dna merges with host cell dna

lysogenic     no symptoms

lytic               viral dna takes over

lysogenic     virus does not destroy host cell

lytic               virus destroys host cell

lytic               induces symptoms of viral infection

lysogenic       cell reproduces and spreads provirus

before, trains worked using the steam engine. thus, it uses heat so it is crucial to apply heat balance. the steam engine absorbs energy during the stage of boiling water. so, this is the endothermic reaction. when the steam is used to work the piston, it has to release this energy through running the train. the excess energy is released as an exhaust to the chimney. this is the exothermic process because it releases energy to the surroundings.