Eukaryotic Gene Definition

Steps:

• Recall that eukaryotic genes are segments of DNA containing instructions for protein synthesis.
• Identify key terms: genes consist of nucleotides in DNA, coding for functional proteins.
• Compare choices: evaluate molecule type (DNA vs. RNA) and coding product (protein vs. polypeptide).
• Select the option matching the standard biological definition.

Why B is correct:

• A eukaryotic gene is defined as a sequence of nucleotides in DNA that codes for a protein, per molecular biology standards.

Why the others are wrong:

• A: Uses "bases" instead of "nucleotides" and specifies "polypeptide" rather than the broader "protein."
• C: Genes are in DNA, not RNA; RNA transcripts do not define the gene itself.
• D: Incorrectly places the gene in RNA and uses "polypeptide" instead of "protein."

Final answer: B