Question

Which of these class III promoter type resemble class II?

(a) Type I

(b) Type II

(c) Type III

(d) Type IV

The question was posed to me in class test.

My query is from Transcription in Eukaryotes : Activators and Repressors topic in section Gene Expression : Transcription Prokaryotes of Cytogenetics

Answer 1

Right choice is (c) Type III

The explanation is: The Type III of class III promoter is a non-classical class III promoter which resembles type II. It has a TATA box, PSE and an upstream DSE. There is no 4^th type of class III promoter and type I and II don’t resemble class II.