state and explain why blood agar is usually stabbed during streaking when isolating beta streptococci
state and explain why blood agar is usually stabbed during streaking when isolating beta streptococci
When Streptococci spp. are grown on agar containing blood, there are often clear zones around the colonies. This demonstrates that: OA Catalase has broken down the hydrogen peroxide resulting in a clear area with no pigment. B. Beta haemolysis has occurred. O C. Hydrogen peroxide has been produced which bleaches the red blood cells. D. Alpha haemolysis has occurred. When Streptococci spp. are grown on agar containing blood, there are often clear zones around the colonies. This demonstrates that: OA...
When we cultured the throat swab, why was the loop stabbed into the agar? to make sure bacteria grow on the agar to protect catalases that are sensitive to the environment O to isolate colonies for hemolytic test O to surround the bacteria with mannitol salt O to protect hemolysins that are sensitive to oxygen
a catalase test is usually not performed on bacteria growing on a blood agar plate. Why not?
PRE-LAB QUESTIONS 1. Could blood agar be classified as a selective or differential medium? Explain. 2. Describe, briefly, the three common types of hemolysis. 3. If multiple colonies are seen on your blood agar plate after the incubation and all of them exhibit a-hemolysis, are they all members of the same species? Why or why not?
Explain why not adding enough sodium bicarbonate during the purification process results in isolating less aspirin.
Date: Group: Name: Table 2. Bacteria isolated from the skin on the blood agar plate. Colony type-II Colony type-l Colony type-III Gram stai Colony morphology, margin, elevation, color, etc. Hemolysis Table 3, Bacteria isolated from the rectal area on the EMB plate. Colony type-I Colony type-III Colony type-II Gram stain Colony morphology, margin, elevation, color, etc. Colony arrangement 4. Review questions d. In summary, what is the major purpose of this experiment? What are four reasons for knowing which microorganisms...
1. Usually blood pressure is measured on the arm at the same level as the heart. Why? How would the results differ if the measurement were made on the leg instead? 2. Use Bernoulle’s equation to explain why a house roof is easily blown off during a tornado or hurricane.
Lab Report-Carbohydrates 1. Purpose 2. Special Media for Isolating Bacteria (Lab #12) a. Why are dyes such as phenol red, eosin or methylene blue added to the media? b. How does the bacterium change the media (i.e color of agar or colonies) after incubation? C. In this experiment, which media are selective, and which are differential? d. How did the results observe on the mannitol salt agar and EMB agar correlate to the Gram reaction of the bacteria? e. What...
1) Explain why changing blood viscosity would or would not be a reasonable method for the body to control blood flow. 2) Explain why changing blood vessel length would or would not be a reasonable method for the body to control blood flow. 3) Describe what happens to pressure and flow during exercise and explain why they change in that way.
Why mucus increase when blood vessel inflammed? what kind of reason and mechanism? Please explain it detail.