Table of Contents
Where is RNA polymerase 3 located?
the nucleus
RNA polymerase III is also located in the nucleus. This polymerase transcribes a variety of structural RNAs that includes the 5S pre-rRNA, transfer pre-RNAs (pre-tRNAs), and small nuclear pre-RNAs.
What is the function of RNA polymerase III?
RNA polymerase (Pol) III transcribes small untranslated RNAs such as 5S ribosomal RNA, transfer RNAs, and U6 small nuclear RNA. Because of the functions of these RNAs, Pol III transcription is best known for its essential contribution to RNA maturation and translation.
Where RNA polymerase is found?
In addition, separate RNA polymerases (which are similar to bacterial RNA polymerases) are found in chloroplasts and mitochondria, where they specifically transcribe the DNAs of those organelles.
Which of RNA is synthesized by RNA polymerase III in eukaryotes?
In eukaryote cells, RNA polymerase III transcribes DNA to synthesize ribosomal 5S rRNA, tRNA and other small RNAs.
Where are RNA polymerase enzymes synthesized?
RNA polymerase I2 is responsible for synthesizing most ribosomal RNA (rRNA) transcripts. These transcripts are produced within the nucleolus, a region within the nucleus where ribosomes are assembled.
What does RNA polymerase III and III do?
RNAP II is responsible for transcription of most of the genes in eukaryotes, RNAP I transcribes multiple copies of the single gene for the large rRNA, and RNAP III transcribes short non-coding RNAs such as tRNAs, 5S rRNA, U6 snRNA and a limited number of others.
Which RNA below is transcribed by RNA polymerase III?
RNA polymerase III transcribes both tRNA and the 5S rRNA component of the large ribosomal subunit, and several signaling-regulated factors are involved in this transcription.
What is synthesized by RNA polymerase 3?
In eukaryote cells, RNA polymerase III (also called Pol III) is a protein that transcribes DNA to synthesize ribosomal 5S rRNA, tRNA and other small RNAs. The genes transcribed by RNA Pol III fall in the category of “housekeeping” genes whose expression is required in all cell types and most environmental conditions.
Which of the following promoter elements are recognized by RNA polymerase III?
The classical RNA polymerase III promoters are Type I and Type II which have promoters that lie wholly within the genes. These Type I and Type II genes include a variety of RNA genes such as tRNA, the 5S RNA subunit of the ribosome, and adenovirus VA RNA genes (Fig. 3.23).
Where is prokaryotic RNA polymerase found?
Prokaryotic Promoters The σ subunit of prokaryotic RNA polymerase recognizes consensus sequences found in the promoter region upstream of the transcription start sight. The σ subunit dissociates from the polymerase after transcription has been initiated.
Where does RNA polymerase function?
RNA polymerase is the main transcription enzyme. Transcription begins when RNA polymerase binds to a promoter sequence near the beginning of a gene (directly or through helper proteins). RNA polymerase uses one of the DNA strands (the template strand) as a template to make a new, complementary RNA molecule.
Where does RNA polymerase II come from?
RNA polymerase II (RNAP II and Pol II) is a multiprotein complex that transcribes DNA into precursors of messenger RNA (mRNA) and most small nuclear RNA (snRNA) and microRNA. It is one of the three RNAP enzymes found in the nucleus of eukaryotic cells.
Where is the location of translation?
Translation takes place on ribosomes in the cell cytoplasm, where mRNA is read and translated into the string of amino acid chains that make up the synthesized protein.