Concept explainers
To describe: The reason why CFU is more applicable to a culture of Streptococcus than to a culture of E. coli.
Introduction: The culture medium or growth medium is a liquid, solid, or semisolid designed to support the growth of cells or microorganisms. The microbial culture is defined as the propagation of the microorganism in a culture or growth medium under controlled laboratory conditions. The microbial culture is used to determine the organism types and its abundance in the sample.
Explanation of Solution
The colony-forming unit is used to measure the number of viable fungal and bacterial cells in a sample. Streptococcus is spherical-shaped or Gram-positive bacteria that belong to the family Streptococcaceae. Streptococcus forms chains and multiple cells may make up a colony. Thus, the colony-forming units are more applicable to a culture of Streptococcus than to a culture of E. coli that do not form chains.
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Chapter 19 Solutions
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