Which components are classified as introns?

Which components are classified as introns?

• A. Non-coding sequences in RNA transcripts
• B. Exons coding for proteins
• C. Functional protein structures
• D. Transcription factors in DNA

Answer: (A)

Introns are defined as the non-coding sequences found within RNA transcripts that are transcribed from DNA but are not translated into proteins. During the process of gene expression, introns are initially included in the primary RNA transcript but are subsequently removed during RNA splicing, resulting in the formation of mature mRNA. This mature mRNA consists solely of exons, which are the coding sequences that will be translated into proteins. The other components listed do not fit the definition of introns. Exons, for example, are regions that code for proteins, while functional protein structures refer to the end products of gene expression. Additionally, transcription factors play a role in the regulation of gene expression at the DNA level and are not classified as introns, which are specific to RNA transcripts. Therefore, the choice identifying introns as non-coding sequences in RNA transcripts is accurate and reflects the essential role of introns in gene expression.

Introns are defined as the non-coding sequences found within RNA transcripts that are transcribed from DNA but are not translated into proteins. During the process of gene expression, introns are initially included in the primary RNA transcript but are subsequently removed during RNA splicing, resulting in the formation of mature mRNA. This mature mRNA consists solely of exons, which are the coding sequences that will be translated into proteins.

The other components listed do not fit the definition of introns. Exons, for example, are regions that code for proteins, while functional protein structures refer to the end products of gene expression. Additionally, transcription factors play a role in the regulation of gene expression at the DNA level and are not classified as introns, which are specific to RNA transcripts. Therefore, the choice identifying introns as non-coding sequences in RNA transcripts is accurate and reflects the essential role of introns in gene expression.