Module 4 Lab Report Already Passed

A false positive due to fermentation of lactose by a non-enteric {Ans: EMB agar selects against gram-positive organisms in order to prevent ________.}The presence of E. coli can indicate human waste contamination. {Ans: Why is the presence of E. coli significant in an EMB test?}An anaerobic environment has been successfully established within the jar. {Ans: You have placed cultures in an anaerobic jar, activated the chemical pack, and sealed the jar. Later in the day you check the jar and notice that the methylene blue strip is colorless. What does this indicate?}Group A Streptococci {Ans: Blood agar is an enriched and differential media used for the growth, differentiation, and detection of organisms with hemolytic activity. Hemolysis is the destruction of red blood cells. Some organisms produce enzymes known as hemolysins in order to break open red blood cells and use the contents, such as hemoglobin, as a nutrient source. Streptococci are the most common hemolytic bacteria that cause disease and much of their virulence can be attributed to their hemolytic activity. Streptococci are even classified according to their hemolytic activity, such as Group A Strep (GAS) or Group B Strep (GBS). This is known as the