Which of the following is a type of post-translational modification in eukaryotes?

Which of the following is a type of post-translational modification in eukaryotes?

• A. Shine Dalgarno sequence
• B. 5' cap addition
• C. Operon arrangement
• D. No modifications

Answer: (B)

Post-translational modifications refer to the chemical modifications that proteins undergo after their translation from mRNA. These modifications can affect a protein's function, activity, localization, and stability. The addition of a 5' cap to the mRNA during the processing of pre-mRNA in eukaryotes plays an essential role in the stability of the mRNA, its export from the nucleus, and the initiation of translation. While the 5' cap is technically associated with mRNA processing rather than a direct modification of the protein itself, it is fundamental to the overall process of gene expression in eukaryotes, making it a vital part of post-translational control. In contrast, the Shine-Dalgarno sequence is involved in the initiation of translation in prokaryotes and is not applicable to eukaryotic systems. Operon arrangements are a feature of prokaryotic gene regulation and do not pertain to post-translational modifications. The option stating "No modifications" does not apply, as post-translational modifications are a common and critical aspect of protein biology in eukaryotes. Thus, the addition of a 5' cap is a key modification relevant to eukaryotic gene expression, establishing

Post-translational modifications refer to the chemical modifications that proteins undergo after their translation from mRNA. These modifications can affect a protein's function, activity, localization, and stability.

The addition of a 5' cap to the mRNA during the processing of pre-mRNA in eukaryotes plays an essential role in the stability of the mRNA, its export from the nucleus, and the initiation of translation. While the 5' cap is technically associated with mRNA processing rather than a direct modification of the protein itself, it is fundamental to the overall process of gene expression in eukaryotes, making it a vital part of post-translational control.

In contrast, the Shine-Dalgarno sequence is involved in the initiation of translation in prokaryotes and is not applicable to eukaryotic systems. Operon arrangements are a feature of prokaryotic gene regulation and do not pertain to post-translational modifications. The option stating "No modifications" does not apply, as post-translational modifications are a common and critical aspect of protein biology in eukaryotes.

Thus, the addition of a 5' cap is a key modification relevant to eukaryotic gene expression, establishing