Streptomycin, an antibiotic, is now less effective at treating TB worldwide. Why?
There is an increase in the number of people with drug resistant infections
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15
Name the inflexible material that makes up the bacterial cell wall of bacteria cells
peptidogylcan (murein)
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thief
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15
Name the enzyme secreted by young bacterial cells as they grow to allow them to stretch
autolysins
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15
What happens to people continually re-infected by different strains of malaria
They become immune
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15
Give one reason why the body's immune system finds it difficult to recognise HIV
it changes its surface proteins
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15
Mycobacterium bovis is the form of TB transmitted to humans by contact with
cattle
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15
How does penicillin work?
prevents bacteria from making normal cell walls resulting in osmotic lysis
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20
Name three examples of how HIV can be transmitted
unprotected sexual intercourse, blood donation (untested), sharing of needles (IV drug users) , mother to child (birth, across the placenta, breast feeding)
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15
Why was the eradication program against malaria unsuccessful?
Plasmodium developed resistance to drugs, Anopheles mosquitos became resistant to DDT and other insecticides
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15
How long could it take an untreated person to develop AIDS from HIV?
