Ubiquity, Blood Agar, Sterilization

Two different bacterial samples, A and B, were inoculated onto Blood agar. What conclusions can you make?
-Specimen A exhibits alpha hemolysis
-Specimen A exhibits beta hemolysis
-Specimen A exhibits gamma hemolysis
-Specimen B exhibits alpha hemolysis
-Specimen B exhibits beta hemolysis
-Specimen B exhibits gamma hemolysis

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Two different bacterial samples, A and B, were inoculated onto Blood agar. What conclusions can you make?
-Specimen A exhibits alpha hemolysis
-Specimen A exhibits beta hemolysis
-Specimen A exhibits gamma hemolysis
-Specimen B exhibits alpha hemolysis
-Specimen B exhibits beta hemolysis
-Specimen B exhibits gamma hemolysis

-Specimen A exhibits beta hemolysis
-Specimen B exhibits gamme hemolysis

Image: Two different bacterial samples, A and B, were inoculated onto Blood agar. What conclusions can you make?
-Specimen A exhibits alpha hemolysis
-Specimen A exhibits beta hemolysis
-Specimen A exhibits gamma hemolysis
-Specimen B exhibits alpha hemolysis
-Specimen B exhibits beta hemolysis
-Specimen B exhibits gamma hemolysis

The lysis of red blood cells in blood agar is indicative of the presence of which enzymes?
-bacteriolysin O and S
-streptolysin O and S
-exoenzymes
-lysozyme

streptolysin O and S

When looking at a blood agar plate with bacterial growth, beta is complete lysis of the red blood cells, alpha is partial lysis, and gamma is no lysis. (T/F)

An organism that obtains its nutrients from dead organic matter is a(n) __________.
-thallus
-autotroph
-parasite
-saprophyte
-pathogen

In this exercise, you will expose Sabouraud agar to air or other areas to determine if both bacteria and fungi are present. (T/F)

Microbes that have a mutualistic relationship with their host are beneficial to their host, while __________.
-commensals have little or no effect on the host
-symbionts benefit at the expense of the host
-parasites cause disease
-pathogens kill the host

commensals have little or no effect on the host

Two organisms that both benefit from each other are in a symbiotic relationship called
-parasitism.
-mutualism.
-ammensalism.
-commensalism.

To sterilize the nutrient broth and nutrient agar, the tubes and bottles are __________.
-kept in the refrigerator
-autoclaved
-placed in a water bath
-steamed
-boiled

Why is boiling an ineffective means of sterilizing microbial media?
-Endospores can withstand boiling temperatures.
-Many microbes multiply at boiling temperatures.
-Many nutrients in the media are destroyed by boiling.
-Mesophiles can withstand boiling temperatures.
-Agar is destroyed by boiling.

Endospores can withstand boiling temperatures

An antimicrobial chemical used to sanitize a lab bench is called a(n)______.
-antiseptic
-antibiotic
-preservative
-sterilizer
-disinfectant