Answer:
The correct answer is "bacterial cells and host cells both use ribosomes for protein synthesis".
Explanation:
The therapeutic index is defined as the ratio of the toxic dose to the therapeutic dose, which gives a comparison between the blood concentration at which a drug is toxic in comparison to the concentration at which the drug is effective. When comparing the therapeutic index of a protein synthesis inhibitor and a cell wall inhibitor, we can notice that the therapeutic index of a protein synthesis inhibitor is lower. This happens because both bacterial cells and host cells use ribosomes for protein synthesis, and since both target the ribosome, the therapeutic effect of the synthesis inhibitor is reached firstly.
