Question

What do group I and group II introns have in common?

1) Both are found in mitochondrial genes.
2) Both are found in bacteriophages.
3) Both are known to be self-splicing introns.
4) Both are found in protein-coding genes of chloroplasts.
5) Both are frequently found in eukaryotic genes.

Answer 1

Both Group I and Group II introns are self-splicing, found in mitochondrial genes, chloroplast genes, some bacterial genes, and rarely in lower eukaryotic genes.

Step-by-step explanation:

Both Group I and Group II introns are classified as self-splicing introns, meaning they are capable of removing themselves from RNA transcripts without the need for additional proteins. Group I introns can be found in mRNA and tRNA genes in bacteria, and mitochondrial and chloroplast genes. They are occasionally found in bacteriophage genes and in nuclear genes of lower eukaryotes. On the other hand, Group II introns can be found in chloroplast and mitochondrial rRNA, mRNA, tRNA, and some bacterial mRNAs. Both Group I and Group II introns form complex secondary and tertiary stem-loop structures which allow them to splice themselves.