Table of Contents
- 1 What is meant by Polycistronic mRNA give an example?
- 2 What is polycistronic in prokaryotes?
- 3 What is meant by Polycistronic?
- 4 What is the reason for the ability of prokaryotes to use polycistronic mRNA?
- 5 What is the difference between Monocistronic and polycistronic mRNA?
- 6 What is polycistronic mRNA?
- 7 What is monocistronic and eukaryotic mRNAs?
What is meant by Polycistronic mRNA give an example?
Polycistronic mRNA is mRNA that codes for multiple different protein products. Generally, Polycistronic mRNA is found in prokaryotes. For example, if a bacterial cell wants to use lactose as an energy source it will transcribe an mRNA molecule that encodes for multiple protein products necessary for lactose metabolism.
How is Polycistronic mRNA translation?
How are polycistronic mRNAs produced? Polycistronic mRNAs are transcribed as a single transcription unit, that is, a single mRNA that contains the information from more than one gene. Don’t forget that translation of these mRNAs is also occurring simultaneously with transcription.
What is polycistronic in prokaryotes?
Most of the prokaryotic mRNAs are polycistronic which means that multiple genes are present on a single transcript and the single promoter initiates transcription of all those genes and regulates their expression. They have multiple initiation and termination codons and thus translate more than one protein.
What produces Polycistronic mRNA?
In prokaryotes, genes which encode proteins with relationships in a metabolic pathway form Operons – which produce polycistronic mRNA’s. An operon is in bacterial DNA, a cluster of contiguous genes transcribed from one promoter that gives rise to a polycistronic mRNA.
What is meant by Polycistronic?
polycistronic Describing a type of messenger RNA that can encode more than one polypeptide separately within the same RNA molecule. Bacterial messenger RNA is generally polycistronic. Compare monocistronic.
What is a polycistronic mRNA and why is it useful in bacterial system?
One region that exhibits a group of different polycistronic messages from the same region is the psbb/psbH/petB/petD region….Transcription Products.
| Gene | Product | Complex |
|---|---|---|
| psbH | 10 kd phosphoprotein of PSII | PSII |
| petB | cytochrome b6 | Cytochrome |
| petD | subunit 4 of cytochrome b6/f | Cytochrome |
What is the reason for the ability of prokaryotes to use polycistronic mRNA?
One key characteristic of prokaryotic mRNAs is that they can be polycistronic. A polycistronic mRNA contains two or more cistrons, each of which can be translated to an individual protein independently. Consequently, more than one protein can be produced from the same polycistronic mRNA.
What are the benefits of polycistronic mRNA to bacterial cells?
What are the benefits of polycistronic mRNA to bacterial cells? All of the proteins for a single enzymatic pathway will be coordinately available. Polycistronic mRNA is shorter than monocistronic mRNA. Polycistronic mRNA undergoes pre-mRNA processing.
What is the difference between Monocistronic and polycistronic mRNA?
Polycistronic mRNA is a mRNA that encodes several proteins and is characteristic of many bacterial and chloroplast mRNAs. Polycistronic mRNAs consist of a leader sequence which precedes the first gene. Monocistronic mRNA is a mRNA that encodes only one protein and all eukaryotic mRNAs are monocistronic.
What is the benefit to a polycistronic arrangement?
What are the benefits of polycistronic mRNA to bacterial cells? Select all of the correct answers….
| 1 | Polycistronic mRNA undergoes pre-mRNA processing. |
|---|---|
| 3 | Polycistronic mRNA is shorter than monocistronic mRNA. |
What is polycistronic mRNA?
Polycistronic mRNA refers to a messenger RNA which encodes two or more proteins. Polycistronic messenger RNAs participates in the process of protein synthesis (translation) in prokaryotes. Many bacterial mRNAs are fully functional in their primary composition transcripts meaning that they do not require any posttranscriptional modifications.
What is the difference between Cistron and polycistronic?
The polycistronic mRNA contains codons of more than one cistron. The polycistronic mRNA is transcribed from a more than one gene (cistron) and has many initiations and termination codons. And also it codes for more than one protein. The polycistronic mRNA carries several open reading frames (ORFs).
What is monocistronic and eukaryotic mRNAs?
Eukaryotic mRNA is monocistronic, and it contains genetic information which codes only for one protein. So they produce single protein after the translation process. Eukaryotic mRNAs are invariably monocistronic in nature. The monocistronic mRNA has only a single open reading frame known as “ORF.”
What is the function of the messenger mRNA?
The messenger mRNA is highly important RNA molecule which carries genetic information that can produce respective polypeptide chain or protein. According to the theory of central dogma proposed by Watson and Crick, the mature mRNA is translated into a protein later that has a specific function.