Ribosome has following enzymatic activity?
**Core Concept**
Ribosomes are complex molecular machines responsible for protein synthesis in cells. They consist of two subunits, large and small, and contain various enzymatic activities crucial for the translation process.
**Why the Correct Answer is Right**
Ribosomes have peptidyl transferase activity, which is essential for forming peptide bonds between amino acids during protein synthesis. This activity is catalyzed by the ribosomal RNA (rRNA) component of the ribosome, specifically by the 23S rRNA in bacteria and the 28S rRNA in eukaryotes. The peptidyl transferase center is the site where the ribosome catalyzes the formation of peptide bonds between amino acids.
**Why Each Wrong Option is Incorrect**
* **Option A:** Ribosomes do not have helicase activity, which is responsible for unwinding DNA or RNA double helices. This is a function of enzymes such as helicases, topoisomerases, and RNAases.
* **Option B:** Ribosomes do not have phosphodiesterase activity, which is involved in breaking phosphodiester bonds in nucleic acids. This is a function of enzymes such as RNase and DNAase.
* **Option C:** Ribosomes do not have kinase activity, which is responsible for transferring phosphate groups to proteins or other molecules. This is a function of enzymes such as protein kinases.
**Clinical Pearl / High-Yield Fact**
The peptidyl transferase center of the ribosome is a unique example of a ribozyme, where the rRNA component of the ribosome acts as a catalyst for peptide bond formation. This is a crucial aspect of protein synthesis and has significant implications for understanding the molecular mechanisms of protein synthesis and its regulation.
**Correct Answer: C.**