(i) Explain the effect of the ionising radiation on the bacteria. (ii) Identify the purpose of petri dish C. (iii) Explain why scientists must continue to develop new antibiotics.

Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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(c)
Public health scientists wanted to investigate the effect of ionising radiation on the
growth of Salmonella typhimurium in the presence of antibiotics.
They grew bacterial colonies of Salmonella typhimurium in petri dishes labelled A, B
and C.
The Petri dishes were kept at 36°C for 48 hours, with scientists observing the bacteria
every 24 hours.
The results for this investigation are below.
Petri
dish
A
B
с
Treatment
Was subjected to
ionising radiation
followed immediately
by a dose of antibiotic
X
An equal amount of
antibiotic X was added
(as was added to Petri
dish A)
Was given neither
ionising radiation nor
antibiotic X
After 24 hours
Small spots of growth
on surface
No growth
Growth across whole
surface
After 48 hours
(ii) Identify the purpose of petri dish C.
Large spots of growth
on surface
No growth
Growth across whole
surface
(i) Explain the effect of the ionising radiation on the bacteria.
(iii) Explain why scientists must continue to develop new antibiotics.
Transcribed Image Text:(c) Public health scientists wanted to investigate the effect of ionising radiation on the growth of Salmonella typhimurium in the presence of antibiotics. They grew bacterial colonies of Salmonella typhimurium in petri dishes labelled A, B and C. The Petri dishes were kept at 36°C for 48 hours, with scientists observing the bacteria every 24 hours. The results for this investigation are below. Petri dish A B с Treatment Was subjected to ionising radiation followed immediately by a dose of antibiotic X An equal amount of antibiotic X was added (as was added to Petri dish A) Was given neither ionising radiation nor antibiotic X After 24 hours Small spots of growth on surface No growth Growth across whole surface After 48 hours (ii) Identify the purpose of petri dish C. Large spots of growth on surface No growth Growth across whole surface (i) Explain the effect of the ionising radiation on the bacteria. (iii) Explain why scientists must continue to develop new antibiotics.
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