monocistronic and polycistronic definition

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.

1. What is the difference between Monocistronic and Polycistronic mRNA?
2. What does Polycistronic mean?
3. What is Cistron differentiate between Monocistronic and Polycistronic transcription units?
4. What is Polycistronic transcription unit?
5. What is a Cistron?
6. What does Monocistronic mean?
7. Is lac operon DNA?
8. What is operon and its function?
9. Is lac operon Polycistronic?
10. What do you mean by Monocistronic transcriptional unit?
11. What are exons?
12. What are exons and introns Class 12?

What is the difference between Monocistronic and Polycistronic mRNA?

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.

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.

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 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 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 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 DNA?

Structure of the lac operon. The DNA of the lac operon contains (in order from left to right): CAP binding site, promoter (RNA polymerase binding site), operator (which overlaps with promoter), lacZ gene, lacY gene, and lacA gene.

What is operon and its function?

Operon, genetic regulatory system found in bacteria and their viruses in which genes coding for functionally related proteins are clustered along the DNA. This feature allows protein synthesis to be controlled coordinately in response to the needs of the cell.

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 do you mean by Monocistronic transcriptional unit?

Answer: A cistronis strath of bass 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 mayhave ceding sequences for more than one polypeptide.

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.