Question

Choose the correct statement.

• A. Transcription and translation occur in same compartment for prokaryotes
• B. Monocistonic RNA-more than one structural genes under single promoter
• C. Introns and exons both code for protein synthesis
• D. In prokaryotes, splicing and tailing occurs before translation

Answer 1

The correct option is A Transcription and translation occur in same compartment for prokaryotes

In prokaryotes, there is no separation between cytoplasm and nucleus. Hence, transcription and translation take place in the same compartment. Also, translation can begin much before the mRNA is fully transcribed. Therefore, transcription and translation are combined and prokaryotes do not need to undergo splicing, capping and tailing.

A cistron is a segment of DNA that codes for a polypeptide. Eukaryotes have monocistronic gene i.e one mRNA codes for a single polypeptide. Prokaryotes have polycistronic mRNA which means more than one structural genes are regulated by a single promoter.

Sequence that appear in mature RNA and code for proteins are called exons. The exons are interrupted by introns. Introns do not appear in mature or processed RNA and do not take part in protein synthesis.