Question

Polycistronic mRNA is characteristic of
A. Prokaryotes
B. Eukaryotes
C. Both A and B
D. Eukaryotes and viruses

Answer 1

Hint: The segment of DNA that's like a gene specifies one functional unit. Cistron may be a segment of DNA that codes for one polypeptide. A Transcription unit refers to the sequence of nucleotides present within the DNA required for the formation of an RNA. it's going to be monocistronic or polycistronic.

Complete Answer:
A gene is often monocistronic or polycistronic. Monocistronic mRNA is where just one gene is expressed from a promoter region. Each of them has its own promoter and terminator region. Polycistronic mRNA is the one that encodes several proteins. It's characteristic of the many bacterial and chloroplast mRNAs. Polycistronic mRNAs contain a pacesetter sequence that precedes the primary gene. Here many genes are present per promoter region.

Now allow us to gather information about given options:
- Prokaryotes: These have polycistronic mRNA . The polycistronic genes synthesized different proteins or polypeptides. The transcription in prokaryotes usually occurs in cytoplasm with the assistance of transcription enzymes.
- Eukaryotes: These have monocistronic mRNA . The monocistronic genes synthesized one sort of polypeptide or protein. The monocistronic structural genes possess structural genes that have interrupted coding sequences.
- Both A and B: This feature can't be correct as eukaryotes have monocistronic mRNA.
- Eukaryotes and viruses: Eukaryotes these have monocistronic mRNA . in viruses no transcription takes place in order that they do not possess mRNA

Hence the correct answer is option A.

Note: The codes for a selected polypeptide present within the protein synthesis are the molecules obtained from the DNA and RNA. Cistron performed functions like coding of the sequence, transcription start and stop signals, and also found within the polycistronic mRNA, monocistronic mRNA and within the operons.