A bacterial genome has been sequenced. Which finding would be least likely? a. Eighty-eight percent of its genome is devoted to protein-coding sequences or RNA genes. b. The bulk of its genome is contained in a single chromosome. c. It has plasmids. d. It has introns. e. It has about 6.4 million nucleotides in its genome.
D
The least likely finding among the options provided is D. It has introns.
Introns are non-coding sequences that interrupt coding sequences (exons) in eukaryotic genes. Bacteria are prokaryotic organisms that lack a nucleus and do not undergo splicing of RNA transcripts. Therefore, they do not have introns.
Option A is a common finding in bacterial genomes, as they have compact genomes with a high proportion of protein-coding sequences. Option B is also a common feature, as bacteria usually have a single chromosome, although some may have several. Option C is also possible, as some bacteria carry plasmids, which are small, circular DNA molecules that replicate independently of the chromosome. Option E represents an average genome size for many bacteria.
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