Which of the following it not a molecule involved in regulat

Which of the following it not a molecule involved in regulating the initiation of transcription? Repressors. Alternative sigma factors. Sigma factors. Reporters.

Solution

Transcription is a process in which RNA polymerase uses the DNA as a template strand and manufactures the mRNA. The mRNA would then go on to produce the encoded protein. Along with RNA polymerase, several other key molecules play an integral role in the initiation of transcription.

1. Repressors - These are small molecules that bind to the DNA at the place where the RNA polymerase would generally bind. Therefore, removal of repressor molecules would initiate the trascription process.

2. Sigma factors - A sigma factor ( factor) is a protein needed only for initiation of RNA synthesis. It is a bacterial transcription initiation factor that enables specific binding of RNA polymerase to gene promoters.

3. Alternative Sigma factors - These molecules are produces by the cell under conditions of stress, like osmotic stress or higher temperature.

4. Reporters - Reporter molecules do not have a role in trascription initiation. They are responsible for signal transduction and cascade mechanisms. There are thousands of different reporter molecules in biology, both natural as well as synthetically prepared.

Therefore, the correct option is OPTION D.