Question

In eukaryotes, which parts of a gene are transcribed into RNA? Choose one:

A. introns and exons
B. introns only
C. exons only
D. the protein-coding region only

Answer 1

In eukaryotes, both introns and exons are transcribed into RNA, making option A the correct answer. Introns, however, are non-coding and removed during RNA processing through splicing, leaving exons to be translated into protein.

Step-by-step explanation:

In eukaryotes, the parts of a gene that are transcribed into RNA are both the introns and exons. However, it's important to note that although both are transcribed, only the exons are eventually translated into proteins. The introns are non-coding sequences that are removed during the RNA processing stage before the mRNA exits the nucleus to be translated at the ribosome. This process of removal is known as splicing. The primary transcript or pre-mRNA initially includes introns and exons. After splicing, the mature mRNA is composed exclusively of exons joined together. Thus, the correct choice for which parts of a gene are transcribed into RNA is A. introns and exons.