Does the Presence of Introns/exons in Eukaryotic Cells Provide More

question 20

Multiple Choice

Does the presence of introns/exons in eukaryotic cells provide more potential diversity in gene products (proteins) than is possible in prokaryotic cells?

• A) It doesn't. There is the same potential for gene products (proteins) in a bacterium with 1,000 genes as there is in a eukaryotic cell with 1,000 genes.
• B) It does. Each exon and each intron could be used individually and discretely to make a gene product (protein). Since bacteria lack these, they will have less ability to create different proteins.
• C) It does. Exons/introns can be spliced together in different ways post-transcription to yield different mRNAs (and therefore, different proteins). Bacteria lack this system.
• D) It does. Exons/introns can be spliced together in different ways at the DNA level to eventually yield different mRNAs (and therefore, different proteins). Bacteria lack this system.
• E) It doesn't. Bacteria and eukaryotes have the same number of introns and exons, and can thus synthesize the same types and numbers of proteins.

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