Final answer:
Introns are removed from initial mRNA and generally absent in bacteria, present in the DNA template for transcription, and in eukaryotic genomes but do not code for proteins or form part of the final mRNA. Exons are coding sequences present in the DNA template, eukaryotic genomes, code for proteins, and are part of the final mRNA.
Step-by-step explanation:
Classifying the descriptions based on whether they apply to introns, exons, or both:
- A) True of introns only: Removed from initial mRNA strand prior to translation.
- B) True of introns only: Generally absent from bacterial genomes.
- C) True of both introns and exons: Present in the DNA used as the template for transcription.
- D) True of both introns and exons: Present in eukaryotic genomes.
- E) True of exons only: Code for an amino acid sequence.
- F) True of exons only: Part of the final mRNA strand.
In summary, introns are non-coding sequences removed during pre-mRNA splicing and are generally not found in bacterial genomes, while exons consist of coding sequences that lead to amino acid sequences in proteins and are included in the final mRNA that is translated.