Although spliceosomal introns seem to be limited to eukaryotes, the other three intron classes are not. Genes with group I and II introns have now been found in both bacteria and bacterial viruses.
举一反三
- Introns are found in a few bacterial and archaeal genes.
- Eukaryotes include A: Fungi B: Bacteria C: Viruses D: Viroids E: Prion
- It ________ three years since I left school. Now I miss my classmates very much. A: was B: is C: have been D: had been
- Genes for histones seem to have no introns.
- Group I introns are remarkable because: A: They are spliced by external RNA molecules without protein involvement. B: They are spliced by protein molecules in the absence of external RNA molecules. C: They are autocatalytic. D: They are only present in mitochondrial and chloroplast genomes.