B1 H - Sample set 1 Q9 Answers
9) When bacteria divide they replicate their genome and synthesise their cell wall.
Figure 12 outlines the stages of bacterial replication.
Figure 12 outlines the stages of bacterial replication.
(a) Penicillin inhibits the synthesis of the cell wall in bacteria. Explain the effect of penicillin on bacterial and human cells. (3)
(b) Penicillin, isolated from a fungus, was the first antibiotic used to treat bacterial infections and is still widely used today.
Scientists have genetically engineered bacteria to produce large amounts of penicillin.
Describe how scientists would produce a genetically modified bacterium that produces penicillin. (4)
*(c) MRSA is a bacterium that has evolved to become resistant to antibiotics.
With reference to Darwin’s theory of evolution by natural selection, explain how MRSA bacteria have evolved to become resistant to antibiotics. (6)
(b) Penicillin, isolated from a fungus, was the first antibiotic used to treat bacterial infections and is still widely used today.
Scientists have genetically engineered bacteria to produce large amounts of penicillin.
Describe how scientists would produce a genetically modified bacterium that produces penicillin. (4)
*(c) MRSA is a bacterium that has evolved to become resistant to antibiotics.
With reference to Darwin’s theory of evolution by natural selection, explain how MRSA bacteria have evolved to become resistant to antibiotics. (6)
Answers
