Streptococcus pneumoniae occurs in two colony morphs: smooth and rough. Smooth colonies are virulent and infection of this strain can be lethal. Rough colonies are not virulent. You come across three samples labeled "A", “B" and "C." You inject these samples, singly or in combination, into mice and observe different effects as shown in the table below. You also recover blood samples from each test group to determine if you can isolate bacterial cells. a. Given the assumption that each sample contained only one cell type or extract, what was in each of the samples? b. Explain your answers. Sample Response Type of cells injected of mice A B recovered from blood dead live S cells none live R cells live S cells live R and live S cells live S cells live S cells none none A+B A+C dead dead B+C dead A+B+C dead

Human Anatomy & Physiology (11th Edition)
11th Edition
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Author:Elaine N. Marieb, Katja N. Hoehn
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Chapter1: The Human Body: An Orientation
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Streptococcus pneumoniae occurs in two colony morphs: smooth and rough. Smooth colonies
are virulent and infection of this strain can be lethal. Rough colonies are not virulent. You come
across three samples labeled "A", “B" and "C." You inject these samples, singly or in
combination, into mice and observe different effects as shown in the table below. You also
recover blood samples from each test group to determine if you can isolate bacterial cells.
a. Given the assumption that each sample contained only one cell type or extract, what was
in each of the samples?
b. Explain your answers.
Sample Response Type of cells
injected of mice
A
B
recovered from blood
dead
live S cells
none
none
live R cells
live S cells
live R and live S cells
C
none
A+B
dead
A+C
dead
dead
B+C
А+В+С dead
live S cells
live S cells
Transcribed Image Text:Streptococcus pneumoniae occurs in two colony morphs: smooth and rough. Smooth colonies are virulent and infection of this strain can be lethal. Rough colonies are not virulent. You come across three samples labeled "A", “B" and "C." You inject these samples, singly or in combination, into mice and observe different effects as shown in the table below. You also recover blood samples from each test group to determine if you can isolate bacterial cells. a. Given the assumption that each sample contained only one cell type or extract, what was in each of the samples? b. Explain your answers. Sample Response Type of cells injected of mice A B recovered from blood dead live S cells none none live R cells live S cells live R and live S cells C none A+B dead A+C dead dead B+C А+В+С dead live S cells live S cells
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