difference between monocistronic and polycistronic class 12

The main difference between monocistronic and polycistronic mRNA is that the monocistronic mRNA produces a single protein while polycistronic mRNA produces several proteins that are functionally-related. Furthermore, eukaryotes have monocistronic mRNA while prokaryotes have polycistronic mRNA.

1. How do Polycistronic mRNAs differ from Monocistronic mRNAs?
2. What is Cistron differentiate between Monocistronic and Polycistronic transcription units?
3. What is Cistron a Monocistron and Polycistron?
4. What is Polycistronic transcription unit?
5. What does Monocistronic mean?
6. Is lac operon Polycistronic?
7. What is a Cistron?
8. What is the difference between Monocistronic and Polycistronic?
9. What are exons?
10. What are exons and introns Class 12?
11. Do eukaryotes have Polycistronic mRNA?
12. What is intron and exon?

How do Polycistronic mRNAs differ from Monocistronic mRNAs?

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 Cistron differentiate between Monocistronic and Polycistronic transcription units?

Solution : A cistron is stretch of base sequences that codes for one polypeptide chain including adjacent control regions. ... Monocistronic transcription unit will have all the regulatory and coding sequences for a single polypeptide, Whereas polycistronic may have coding sequenes for more then one polypeptide.

What is Cistron a Monocistron and Polycistron?

A segment of DNA coding for polypeptide is called cistron. A cistron is basically a gene. If a stretch of replicating DNA contains a single cistron (or gene), it is called monocistronic. ... If a stretch of replicating DNA contains more than one cistron, it is called polycistronic, e.g. bacteria and prokaryotes.

What is Polycistronic transcription unit?

MicroRNAs (miRNAs) are small RNAs acting as regulators of gene expression at the post-transcriptional level. In plants, most miRNAs are generated from independent transcriptional units, and only a few polycistronic miRNAs have been described.

What does Monocistronic mean?

Monocistronic is a term used in biochemistry to describe the capacity of eukaryotes to code one gene per one mRNA, as opposed to prokaryotes which can code many genes, sometimes all, on one mRNA, polycistronic.and Cistron is a term used alternatives to gene which is segment of DNA coding for polypeptide.

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.

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 is the difference between Monocistronic and Polycistronic?

The main difference between monocistronic and polycistronic mRNA is that the monocistronic mRNA produces a single protein while polycistronic mRNA produces several proteins that are functionally-related.

What are exons?

An exon is the portion of a gene that codes for amino acids. In the cells of plants and animals, most gene sequences are broken up by one or more DNA sequences called introns.

What are exons and introns Class 12?

Exons are termed as nucleic acid coding sequences, which are present in mRNA. Introns are the non-coding sequences present in the DNA, which are removed by RNA splicing before translation. The intron sequences change frequently with time, whereas, the exon sequences are highly conserved.

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.

What is intron and exon?

Introns are noncoding sections of an RNA transcript, or the DNA encoding it, that are spliced out before the RNA molecule is translated into a protein. The sections of DNA (or RNA) that code for proteins are called exons.