Regulatory protein(s) present in Archaea is/are ?

A)

Activators that stimulate RNA polymerase activity are present in Archaea.

B)

Both activators and repressors are present in Archaea.

C)

Similar to regulation in Eukarya, Archaea lack bacterial-like regulators such as activators and repressors and use transcription factors instead.

D)

Repressors that block RNA polymerase activity are present in Archaea.

 

I had thought it was what is in red, but got it wrong. Can someone point me in the right direction?

Well, archaea are closer to eukarya than bacteria. I don't know the answer though.

That is not quite correct, or at least not quite clear. I will note that the question can seem to be quite misleading, and it is likely that it is supposed to be a trick question, which may have gotten you confused. C) makes a distinction between activators/repressors and transcription factors. However, you will have to know that activators/repressors are just a sub-class of transcription factor and merely describe their regulatory role. So obviously both will be present in all organisms. Since I assume that you can only select one answer you will have to check what each implies (e.g. A) implies there are activators, what would it imply about repressors?).

Two component systems are found in the archaea. Most of the two component systems with which I am familiar are in bacteria, and they are often transcriptional activators.