Antibiotics revision
1. Complete the gaps in the paragraph using the words in the box below:
Antibiotics are a type of _______________ that are used to treat
________________ diseases. They cannot treat communicable diseases
caused by any other types of _______________. For example, they are not
able to treat AIDS because this disease is caused by a __________ called
_______________.
We have to be very careful not to ______________ antibiotics because the
bacteria that cause a disease can become _____________ to the antibiotics.
virus
medicine
pathogens
resistant
overuse
bacterial
HIV
2. Look at the graph on the left. Why do
the number of bacteria go up and then go
back down after the antibiotic is added?
__________________________________
__________________________________
__________________________________
_____________________________________________________________
_____________________________________________________________
3. Look at the picture on the left. Why is there a
clear area around the antibiotic disc?
______________________________________
______________________________________
______________________________________
4. Are there any antibiotics in the picture that
have no effect? How do you know this?
______________________________________
______________________________________
PRACTISE EXAM-STYLE QUESTIONS
Antibiotics
Q1. Students in a school investigated the effect of five different antibiotics A, B, C, D and E
on one type of bacterium. The diagram shows what the Petri dish looked like after 3 days.
a) Explain which antibiotic would be best to treat a disease caused by this type of
bacterium.
(1)
…………………………………………………………………………………………………
…………………………………………………………………………………………………
b) Explain why there is no clear area around antibiotic C.
(2)
…………………………………………………………………………………………………
…………………………………………………………………………………………………
Q2. There has been a large increase in the populations of many antibiotic-resistant strains
of bacteria in recent years.
a) Explain why bacteria may become resistant to an antibiotic.
(2)
…………………………………………………………………………………………………
…………………………………………………………………………………………………
…………………………………………………………………………………………………
b) Explain why antibiotics cannot be used to treat AIDS
(2)
…………………………………………………………………………………………………
…………………………………………………………………………………………………
MARK SCHEME
Antibiotics
Q1
a)
b)
•
•
Bacteria have been able to grow around the antibiotic (paper) disc (1)
Because the antibiotic has had no effect / antibiotic has not killed the bacteria (11
Q2.
a)
b)
•
•
Because AIDS is caused by a virus (1)
Antibiotics don’t treat viruses / antibiotics only treat bacterial disease (1)