Which statement is true regarding mRNA synthesis?

Which statement is true regarding mRNA synthesis?

• A. One monocistronic mRNA synthesizes several different types of protein products
• B. One polycistronic mRNA synthesizes only one type of protein product
• C. One polycistronic mRNA synthesizes several different types of protein products
• D. One polycistronic mRNA synthesizes only one protein product, which is subsequently cleaved into different types of protein products

Answer: (C)

The statement that one polycistronic mRNA synthesizes several different types of protein products is accurate because polycistronic mRNA is characteristic of prokaryotes, where a single mRNA molecule can encode multiple proteins. This occurs through the arrangement of several open reading frames (ORFs) within the same mRNA transcript, each capable of being translated into a distinct protein. In contrast, monocistronic mRNA, which is more common in eukaryotes, typically encodes only one protein product. Thus, options that suggest a monocistronic mRNA synthesizes several proteins or that a polycistronic mRNA synthesizes only one protein product do not align with the fundamental understanding of mRNA organization and function in cellular biology. Therefore, the correct assertion about polycistronic mRNA's capability of coding for multiple proteins highlights its role in prokaryotic gene expression and regulation.

The statement that one polycistronic mRNA synthesizes several different types of protein products is accurate because polycistronic mRNA is characteristic of prokaryotes, where a single mRNA molecule can encode multiple proteins. This occurs through the arrangement of several open reading frames (ORFs) within the same mRNA transcript, each capable of being translated into a distinct protein.

In contrast, monocistronic mRNA, which is more common in eukaryotes, typically encodes only one protein product. Thus, options that suggest a monocistronic mRNA synthesizes several proteins or that a polycistronic mRNA synthesizes only one protein product do not align with the fundamental understanding of mRNA organization and function in cellular biology. Therefore, the correct assertion about polycistronic mRNA's capability of coding for multiple proteins highlights its role in prokaryotic gene expression and regulation.