Introns Are Known to Contain Termination Codons (UAA, UGA, or UAG)

question 9

Multiple Choice

Introns are known to contain termination codons (UAA, UGA, or UAG) , yet these codons do not interrupt the coding of a particular protein. Why?

• A) More than one termination codon is needed to stop translation.
• B) These triplets cause frameshift mutations, but not termination.
• C) Introns are removed from mRNA before translation.
• D) UAA, UGA, and UAG are initiator codons, not termination codons.
• E) Exons are spliced out of mRNA before translation.

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