TFIIB, TFIIE, and TFIIH are required to melt DNA to allow polymerase movement. The last factors to join the initiation complex are TFIIE and TFIIH. 

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#Id: 3857

#Unit 5. Developmental Biology

Phosphorylation of RegA is mediated by sensor histidine kinases/phosphatases which either phosphorylate or dephosphorylate themselves on a histidine residue when a signal molecule binds to their sensor domain.

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#Id: 2486

#Unit 13. Methods in Biology

Photodecomposition of riboflavin generates a free radical that initiates polymerization.

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#Id: 763

#Unit 3. Fundamental Processes

The transition from the closed to the open complex involves “melting” between positions –11 and +2, with respect to the transcription start site.

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#Id: 5518

#Unit 10. Ecological Principles

Net reproductive rate, the average number of female offspring produced by all the females in a population over the course of a generation.

TLS Online TPP Program

#Id: 3257

#Unit 3. Fundamental Processes

Intercalating agents, such as proflavin, acridine, and ethidium, cause the deletion or addition of a base pair or even a few base pairs.