why is that antibiotic affect bactaria but not the host/human cell
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The result is a very fragile cell wall that bursts, killing the bacterium. No harm comes to the human host because penicillin does not inhibit any biochemical process that goes on within us. Bacteria can also be selectively eradicated by targeting their metabolic pathways.
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⇒ Antibiotics are commonly use to block biochemical pathways which is important for bacteria.
⇒ Many Bacteria make cell wall to protect themselves.
⇒ The antibiotic penicillin blocks the bacterial processes that build the cell wall.
⇒ As a result, The growing bacteria are unable to make cell wall and die easily.
⇒ But viruses do not use this path ways therefore antibiotic do not work against viral infection.
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