Question

The term informosome is applied to
(a) tRNA protein complex
(b) mRNA protein complex
(c) mRNA + tRNA complex
(d) rRNA + tRNA complex

Answer 1

Hint: Informosome term is related to informational RNA or template RNA because it brings coded information from DNA for the formation of polypeptides. Formation of polypeptide takes place singly or in multiple forms.

Complete answer:
The term informosome is applied to mRNA protein complexes because it transports mRNA from the nucleus to the cytoplasm where protein synthesis takes place. mRNA is also known as informational RNA and template RNA, which is a long RNA consisting of only 5 percentage of total RNA. mRNA forms polypeptide by the coded information of DNA, it brings that coded information from DNA therefore considered as messenger RNA. If from the coded information only one peptide form then it is considered as monocistronic or if multiple polypeptide form then it is considered as polycistronic.

Additional information:
RNA is of generally seven types rRNA, tRNA, mRNA, genomic RNA, snRNA, scRNA, microRNAs etc, in which rRNA, tRNA and mRNA is considered as important RNA for protein synthesis whereas genomic RNA is present inside virus and Viroids which carries its hereditary information. snRNA or small nuclear RNA is a uridine rich RNA that occurs inside the nucleus and takes part in splicing and formation of other RNA. scRNA or small cytoplasmic RNAs occur in the cytoplasm and helps in protein synthesis present inside gram-positive bacteria. miRNA or micro RNAs found only in multicellular eukaryotes which control genetic information along with development, differentiation, cell proliferation etc.

So, the correct answer is ‘mRNA protein complex’.

Note:
During translation, if an additional sequence adds up before the start codon or at the end of the stop codon of mRNA then this sequence does not get translated and this sequence is considered as untranslated regions or UTR. UTR before start codon is a leader or after stop codon is the trailer.