Which off the following statements concerning ribosomes is NOT true? The genes f

Question

Which off the following statements concerning ribosomes is NOT true? The genes for rRNA are present in multiple copies and moderately repeated throughout the genome. A functional ribosome consists of large and small ribosomal subunits in both eukaryotes and prokaryotes. Precursor ribosomal RNA is processed only in eukaryotic cells but not in bacterial cells. Each ribosomal subunit consists of one or more piece of RNA and a number of proteins. In eukaryotes, small nucleolar RNAs help to process and assemble into mature ribosomes. Which of the following statements INCORRECTLY describe rRNA processing? The eukaryotic 18S, 5.8S and 28S rRNA are generated from a single precursor rRNA transcript while 5S rRNA is encoded by a separate gene. In bacteria, a single gene that encodes all three RNA components The bacterial rRNA precursor is methylated and then cleaved and trimmed to produce the 23S, 5S and 16S rRNA components. Ribosomal RNA is processed in both bacterial and eukaryotic cells. In eukaryotes, snRNAs function to cleave and modify the precursor rRNAs and then help assemble them into mature ribosomes. siRNAs and miRNAs are similar in all of the following EXCEPT that they both get cleaved by an endoribonuclease named Dicer. mediate gene silencing through interacting with the RISC complex. both originate from viral genes integrated during viral infection are both able to affect the gene expression and inhibit translation both form double stranded RNA during processing. Duchenne muscular dystrophy is caused by a mutation in a gene that comprises 2.5 million and specifies nucleotides a protein called dystrophin. However, less than 1 of the gene actually encodes the acids in the dystrophin protein. On the basis of what you now know about gene structure and RNA processing in eukaryotic cells, which of these is the BEST possible explanation for the size of the dystrophin gene? The dystrophin gene likely has many exons that are excised prior to translation of the dystrophin protein. The dystrophin gene likely has many introns that are excised prior to translation of the dystrophin protein. Portions of the dystrophin gene are likely silenced by miRNAs prior to translation of the dystrophin protein. Portions of the dystrophin gene are likely silenced by piRNAs prior to translation of the dystrophin protein. Portions of the dystrophin gene are likely silenced by siRNAs prior to translation of the dystrophin protein.

Explanation / Answer

13. option C is wrong. Precursor Ribosomal RNA is also processed in prokaryotes

14. option c is wrong. bacterial rRNA precursor is not methylated before cleaving into 23S, 5S and 16S rRNA

15. option C is wrong as miRNA can originate only from genome of the organism

16 option a is correct. the dystrophin gene likely has many exons that are excised prior to translation of the dystrophin protein

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