Although Both Humans and Bacteria Have Ribosomes,streptomycin-Which Blocks Ribosome Function-Does

question 47

Multiple Choice

Although both humans and bacteria have ribosomes,streptomycin-which blocks ribosome function-does not harm a human who ingests it.Why?

• A) Human cells have ribosomes that do not bind streptomycin;only prokaryotic ribosomes are affected by this drug.
• B) Human cells contain a cell wall that prevents streptomycin from getting into the cytoplasm.
• C) Human cells are much,much larger than bacteria cells,and antibiotics are diluted so much in the cytoplasm that they are ineffective.
• D) Human cells have an extra lipid layer around their outsides,preventing streptomycin from entering them.
• E) Human cells have far more ribosomes than bacteria,so relatively few ribosomes are blocked by streptomycin.

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