Which statement about introns and exons is incorrect?

Which statement about introns and exons is incorrect?

• A. Introns are the non-coding sequences of a gene.
• B. Exons contain the coding sequences that are expressed.
• C. Splicing removes introns and joins exons.
• D. The majority of a gene's information is contained in introns.

Answer: (D)

Exons carry the coding sequences that will be expressed as protein, while introns are transcribed but non-coding segments that are removed during RNA processing. During splicing, introns are cut out and the remaining exons are joined together to form the mature mRNA, which is then translated. Because the protein-coding information comes from the exons, the statement that most of a gene’s information is contained in introns is incorrect. Introns can have regulatory roles and influence splicing patterns, but they do not provide the primary coding information for the protein. The other statements align with this: introns are non-coding, exons contain the coding sequences, and splicing removes introns and joins exons.

Exons carry the coding sequences that will be expressed as protein, while introns are transcribed but non-coding segments that are removed during RNA processing. During splicing, introns are cut out and the remaining exons are joined together to form the mature mRNA, which is then translated. Because the protein-coding information comes from the exons, the statement that most of a gene’s information is contained in introns is incorrect. Introns can have regulatory roles and influence splicing patterns, but they do not provide the primary coding information for the protein. The other statements align with this: introns are non-coding, exons contain the coding sequences, and splicing removes introns and joins exons.