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
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
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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