OC are constitutive because repressor protein is unable to bind; this allows RNA polymerase to have unrestrained access to the promoter. 

TLS Online TPP Program

#Id: 6485

#Unit 3. Fundamental Processes

Model for the Interaction Between TBP and Promoters

TLS Online TPP Program

#Id: 2735

#Unit 13. Methods in Biology

In Run-on transcription- the RNA polymerase that has already initiated transcription in vivo simply “runs on” or continues to elongate the same RNA chains. 

TLS Online TPP Program

#Id: 5563

#Unit 7. System Physiology – Animal

This gradient is produced by the operation of the loops of Henle as countercurrent multipliers and maintained by the operation of the vasa recta as countercurrent

exchangers 

TLS Online TPP Program

#Id: 8035

#Unit 1. Molecules and their Interaction Relevant to Biology

Negatively charged amino acids have four ionisations zones

1. 1--------pK1 – charge +1

2. pK1---------pKr charge 0

3. pKr---------pK2 charge -1

4. pK2---------14 charge -2

TLS Online TPP Program

#Id: 4836

#Unit 13. Methods in Biology

Example of type I error - In words of community tales, a person may see the bear when there is none (raising a false alarm) where the null hypothesis (H₀) contains the statement: “There is no bear”.