Some antibiotics work by binding to ribosomes and preventing protein synthesis.
Which statement explains why these antibiotics kill bacterial cells but not human cells?
1 )
In bacterial cells mRNA is formed in the cytoplasm from naked DNA.
Ribosomes in human cells have a different structure from those in bacterial cells.
3 )
The antibiotics cannot pass through human cell surface membranes.
4 )
The tRNA molecules in bacterial cells are different from those in human cells.
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