Antibiotics and resistance

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  • Created by: elyornais
  • Created on: 11-04-15 22:41
Why don't bacterial cells burst from water entering by osmosis?
The wall that surrounds them is made of a tough material that is not easily stretched. Cell wall resists expansion and halts further entry of water.
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How do antibiotics prevent bacteria from forming cell walls?
Inhibit synthesis of important peptide cross-linkages in cell walls. This weakens them and they can't withstand the pressure. Osmotic lysis occurs. Only effective when bacteria are growing.
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How are some bacteria resistant to penicillin?
They can produce a protein as a result of mutation. This protein is an enzyme that can break down penicillin before it kills the bacteria.
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How is the gene for antibiotic resistance passed on?
Through horizontal gene transmission and vertical gene transmission.
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How does increased use of antibiotics benefit resistance?
Greater chance that mutant bacterium will have an advantage over normal variety. The mutant may out compete and replace normal variety.
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Why should a patient complete the course of antibiotics?
Because the last bacteria to be killed is the most resistance, so these survive and multiply.
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Why is MRSA a big danger in hospitals?
People in hospitals tend to be older, sicker and weaker so they are more vulnerable.Many people are close together and are examined by doctors and nurses that have touched others.Many ABs are used, strains can easily develop multiple resistance.
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Other cards in this set

Card 2

Front

How do antibiotics prevent bacteria from forming cell walls?

Back

Inhibit synthesis of important peptide cross-linkages in cell walls. This weakens them and they can't withstand the pressure. Osmotic lysis occurs. Only effective when bacteria are growing.

Card 3

Front

How are some bacteria resistant to penicillin?

Back

Preview of the front of card 3

Card 4

Front

How is the gene for antibiotic resistance passed on?

Back

Preview of the front of card 4

Card 5

Front

How does increased use of antibiotics benefit resistance?

Back

Preview of the front of card 5
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