Transcription

MAHATHIR ALPHA · 55問 · 2年前

通報

問題一覧

A transcript copy of a gene used to encode a polypeptide

Messenger RNA

A clover leaf shaped sequence that carries an amino acid

Transfer RNA

A primary component of ribosomes

Ribosomal RNA

Where does transcription occurs?

Nucleus

The sequence of DNA that is transcribed into RNA

Gene

It separates the DNA strands and synthesize a complementary RNA copy from the Anti sense strand.

RNA polymerase

It binds to a site on the DNA at the start of a gene

RNA polymerase

It is considered as the coding strand of the double strand DNA, which runs from 5' direction to 3' direction.

Sense strand

The sense strand is based on the _____________ which runs from 3'to 5'direction.

Template strand

It has the information that would be readable on the RNA and that's called the coding side.

Sense strand

It is the non coding strand

Antisense strand

They play the crucial role in regulating gene expression at multiple levels, such as at replication, transcription, and translation.

Antisense RNAs

It is the strand which serves as the template for the mRNA synthesis during transcription.

Template strand

It is the enzyme involved in the transcription of genes into mRNAs

RNA polymerase

It should be directed from 3' to 5' in order to add complementary nucleotides to the growing mRNA strand in the 5' to 3' direction.

Template strand

It contains the complementary nucleotide sequence as the mRNA.

Template strand

It contains the same nucleotide sequence to mRNA, except thymine.

Coding strand

Contains anti-codon

Template strand

Contains the codons

Coding strand

are formed between the template strand and the synthesizing mRNA, temporary during transcription.

Hydrogen bonds

are formed between the coding strand and the synthesizing mRNA during transcription.

No hydrogen bonds

contains the same nucleotide sequence as the tRNA

Template strand

contains the complementary nucleotide sequence as the tRNA

Coding strand

Transcription starts at RNA polymerase binding sites called ____________ on DNA template strand.

Promoters

In this stage, other eukaryotic factors bind, assembling a transcription complex. RNA polymerase begins to unwind DNA helix.

Initiation

It moves down DNA at constant rate leaving growing RNA strands protruding from the bubble.

Transcription bubble

In this stage, the transcription bubble moves down DNA at constant rate leaving growing RNA strands protruding from the bubble.

Elongation

Stop sequences at the end of the gene cause phosphodiester bond formation to cease, transcription bubble to dissociate, and RNA polymerase to release DNA.

Termination

Where does initation complex forms?

Promoter

How many RNA polymerase enzymes is present in Eukaryotic transcription?

They are modified after transcription

RNAs

Non coding regions are called

Introns

Small nuclear ribonuclearproteins associate with proteins to form what?

Spliceosomes

The other regions are called __________ because they are eventually expresses, usually translated into amino acids

Exons

It removes introns and joins exons, creating a mRNA molecules with a continuous coding sequence.

RNA splicing

RNA splicing is carried out by what?

Spliceosomes

The original transcript from the DNA is called?

Pre-mRNA

Pre-mrna contains both transcript of what?

Exons, Introns

The introns are removed by a process called _________ to produce messenger RNA (mRNA)

Splicing

Purpose of splicing

To produce mRNA

5' prime cap is a specially attached nucleotide on the 5' end of some primary transcript such as precursor messenger RNA.

CAP

protects the mRNA molecule from enzymatic degradation in the mRNA. Stability of the molecules.

Polyadenylation

polyadenylation, protects the mRNA molecule from enzymatic degradation in the mRNA. Stability of the molecules.

POLY-A-TAIL

It forms the pre-mRNA

RNA polymerase I

It forms the tRNA

RNA polymerase III

Proteins often have a modular architecture consisting of discrete structural and functional regions called _________.

Domains

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