Question

multiple choice question
which sections are spliced out of messenger rna molecules before the molecules are used to synthesize proteins?
exons
both introns and exons
genes
introns
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Explanation:

Introns are non - coding regions of pre - mRNA. Before mRNA is used for protein synthesis, introns are removed through a process called splicing, while exons are the coding regions that remain and are joined together. Genes are segments of DNA, not parts of mRNA that are spliced in this context.

Answer:

D. Introns