Table of Contents
- 1 What enzyme carries out transcription in eukaryotes?
- 2 What is transcription in a eukaryotic cell?
- 3 What enzyme is involved in transcription?
- 4 What are the transcription factors in eukaryotes?
- 5 What enzymes are used in transcription and translation?
- 6 Is a transcription factor an enzyme?
- 7 What are the general transcription factors in eukaryotes?
- 8 What proteins are involved in eukaryotic transcription?
What enzyme carries out transcription in eukaryotes?
RNA polymerase
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).
What is transcription in a eukaryotic cell?
Eukaryotic transcription is the elaborate process that eukaryotic cells use to copy genetic information stored in DNA into units of transportable complementary RNA replica. Eukaryotic transcription occurs within the nucleus where DNA is packaged into nucleosomes and higher order chromatin structures.
How does transcription occur in eukaryotes?
Transcription occurs in the nucleus of a eukaryotic cell. In this step, an enzyme called RNA polymerase reads a gene, or segment of DNA, that codes for a particular protein. It does this by unzipping the DNA helix into two strands and making an exact but opposite copy of the gene found there.
What enzyme is involved in transcription?
Transcription is carried out by an enzyme called RNA polymerase and a number of accessory proteins called transcription factors. Transcription factors can bind to specific DNA sequences called enhancer and promoter sequences in order to recruit RNA polymerase to an appropriate transcription site.
What are the transcription factors in eukaryotes?
Classes
- General transcription factors are involved in the formation of a preinitiation complex. The most common are abbreviated as TFIIA, TFIIB, TFIID, TFIIE, TFIIF, and TFIIH.
- Upstream transcription factors are proteins that bind somewhere upstream of the initiation site to stimulate or repress transcription.
What is transcription and where in the eukaryotic cell it occurs?
In a eukaryotic cell, transcription occurs in the nucleus, and translation occurs in the cytoplasm. Transcription and translation are spatially and temporally separated in eukaryotic cells; that is, transcription occurs in the nucleus to produce a pre-mRNA molecule.
What enzymes are used in transcription and translation?
During transcription, the enzyme RNA polymerase (green) uses DNA as a template to produce a pre-mRNA transcript (pink). The pre-mRNA is processed to form a mature mRNA molecule that can be translated to build the protein molecule (polypeptide) encoded by the original gene.
Is a transcription factor an enzyme?
transcription factor, molecule that controls the activity of a gene by determining whether the gene’s DNA (deoxyribonucleic acid) is transcribed into RNA (ribonucleic acid). The enzyme RNA polymerase catalyzes the chemical reactions that synthesize RNA, using the gene’s DNA as a template.
What enzymes are in transcription?
Transcription is carried out by an enzyme called RNA polymerase and a number of accessory proteins called transcription factors.
What are the general transcription factors in eukaryotes?
The holoenzyme consists of a preformed complex of RNA polymerase II, the general transcription factors TFIIB, TFIIE, TFIIF, and TFIIH, and several other proteins that activate transcription.
What proteins are involved in eukaryotic transcription?
Transcription in eukaryotes involves one of three types of polymerases, depending on the gene being transcribed. RNA polymerase II transcribes all of the protein-coding genes, whereas RNA polymerase I transcribes rRNA genes, and RNA polymerase III transcribes rRNA, tRNA, and small nuclear RNA genes.