(Solved): 47. The antibiotic tetracycline binds to the \( 30 \mathrm{~S} \) subunit of the ribosome. The effe ...

47. The antibiotic tetracycline binds to the \( 30 \mathrm{~S} \) subunit of the ribosome. The effect is to A. prevent attachment of DNA. B. prevent peptide bond formation. C. prevent transcription. D. stop the ribosome from moving along the mRNA. E. interfere with the attachment of the tRNA to mRNA-ribosome complex. 48. Chloramphenicol binds to the 50 S ribosome subunit. What effect would occur if this drug is administered to a eukaryote? A. Nothing - eukaryotes have a 60 S large ribosomal subunit, not a \( 50 \mathrm{~S} \). B. The drug would effectively shut down protein synthesis in the eukaryote. C. The drug would bind instead to the \( 30 S \) ribosome subunit, but still shut down protein synthesis. D. The drug would bind to the \( 50 \mathrm{~S} \) ribosome subunit, but at a different location, and protein synthesis would continue. 49. Which of the following antibiotics is recommended for use against gram-negative bacteria? A. polyenes B. bacitracin C. cephalosporin D. penicillin E. polymyxin