The eukaryotic genome is much less tidy and compact than the genomes of prokaryotes. Eukaryotes, but not prokaryotes, have __________.

• A. a large proportion of their DNA that is never expressed
• B. introns, some of which are bigger than the genes they interrupt
• C. short sequences of nucleotides that may be repeated thousands of times
• D. None of the listed responses is correct.
• E. All of the listed responses are correct.

Answer: (E)

Verified step by step guidance

1. Understand that eukaryotic genomes are generally more complex than prokaryotic genomes. This complexity arises from several structural and functional features unique to eukaryotes.
2. Recognize that eukaryotic genomes contain a large proportion of non-coding DNA, which means that much of their DNA is not directly involved in coding for proteins. This includes regulatory sequences, introns, and repetitive DNA.
3. Identify that introns are non-coding sequences found within genes in eukaryotes. These introns can be quite large, sometimes even larger than the exons (coding sequences) they interrupt. Prokaryotes typically do not have introns.
4. Note that eukaryotic genomes often contain short sequences of nucleotides that are repeated thousands of times. These repetitive sequences can be found in various forms, such as satellite DNA, minisatellites, and microsatellites.
5. Conclude that all the listed features (non-coding DNA, introns, and repetitive sequences) are characteristics of eukaryotic genomes, making the statement 'All of the listed responses are correct' the accurate choice.