polycistronic mrna in eukaryotes or prokaryotes

Eukaryotes produce only monocistronic mRNAs. Prokaryotes can produce either monocistronic or polycistronic mRNAs. polycistronic mRNA A single mRNA that carries the information from more than one gene. Usually several genes from same metabolic pathway.

1. Do eukaryotes have Polycistronic mRNA?
2. Do prokaryotes have Polycistronic mRNA?
3. Are prokaryotes Polycistronic?
4. Why do eukaryotes not use Polycistronic mRNA?
5. Where is Polycistronic mRNA found?
6. Is lac operon Polycistronic?
7. Are prokaryotes Monocistronic?
8. What is a Cistron?
9. What are Polycistronic mRNA?
10. Why prokaryotic genes are called Polycistronic?
11. Are eukaryotes Monocistronic or Polycistronic?
12. What does Polycistronic mean?

Do eukaryotes have Polycistronic mRNA?

A corollary of the scanning model is that eukaryotes should normally have no polycistronic gene structures, i.e. mRNAs that code for more than one protein product. However, polycistronic mRNAs are known to exist in eukaryotic viruses [5], hence the eukaryotic translational machinery must have ways to deal with them.

Do prokaryotes have 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.

Are prokaryotes Polycistronic?

Prokaryotic genes are polycistronic, i.e, each gene may code for more than one polypeptide and are under one promoter and one operator. Eukaryotic genes are monocitronic, i.e, each gene, under one promoter and one operator, codes only for a single protein and has only one initiation and a termination codon.

Why do eukaryotes not use Polycistronic mRNA?

for typical eukaryotic transcripts the ribosome falls off of the mRNA and would not be able to reach the next gene. in order for a eukaryotic ribosome to translate a polycistronic mRNA, it needs something that provides a function similar to the shine-delgarno sequence found in prokaryotes.

Where is Polycistronic mRNA found?

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.

Is lac operon Polycistronic?

Bacterial operons are polycistronic transcripts that are able to produce multiple proteins from one mRNA transcript. ... In this case, when lactose is required as a sugar source for the bacterium, the three genes of the lac operon can be expressed and their subsequent proteins translated: lacZ, lacY, and lacA.

Are prokaryotes Monocistronic?

Prokaryotes produce both polycistronic and monocistronic mRNAs. Eukaryotes produce only monocistronic mRNAs.

What is a Cistron?

: a segment of DNA that is equivalent to a gene and that specifies a single functional unit (such as a protein or enzyme)

What are 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.

Why prokaryotic genes are called Polycistronic?

Prokaryote uses polycistronic because they genome is small and want to make everything in one pathway together.

Are eukaryotes Monocistronic or Polycistronic?

Eukaryotic mRNAs are also usually monocistronic, meaning that they each encode only a single polypeptide, whereas prokaryotic mRNAs of bacteria and archaea are commonly polycistronic, meaning that they encode multiple polypeptides.

What does Polycistronic mean?

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.