List of top Zoology Questions on Transcription

Which of the following statements are correct about poly-A-tail addition to a pre-mRNA: A. Polyadenylation signals in mammalian cells consist of the hexanucleotide AAUAAA in addition to upstream and downstream (U- or GU-rich) elements.
B. Polyadenylation signals consist of the hexanucleotide GGUAAA.
C. Poly-A polymerase adds a poly-A tail consisting of about 50 Adenines to the 3' end.
D. Poly-A polymerase adds a poly-A tail consisting of about 200 Adenines to the 3' end.

Which of the following statements are correct about RNA polymerases: A. RNA polymerase I transcribes all ribosomal rRNAs genes.
B. RNA polymerase I and III together transcribe all ribosomal rRNAs genes.
C. RNA polymerase III transcribes genes for tRNAs.
D. RNA polymerase III also transcribes microRNAs (miRNAs) and long noncoding RNAs (lncRNAs).

Correctly arrange the below given Transcription Factors (TFs) as per their involvement in initiation of eukaryotic transcription:

Assertion (A): The transcripts of RNA polymerases I and III are not processed. Reason (R): RNA polymerases I and III lack a C-terminal domain (CTD).

CREB1 is a eukaryotic transcription factor. In which one of the following compartments of the cell is CREB1 predominantly localized?