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Penicillin kills bacteria by blocking the processes that build their:
ANucleus
BFlagella
CRibosomes
DCell wall
Answer & Solution
Correct answer: D. Cell wall
1. Growing bacteria then die easily.
2. Penicillin blocks cell wall building.
3. Human cells have no cell wall, so are unharmed.
_Source: NCERT Class 9 Science, Chapter 13, Why Do We Fall Ill._
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