Homework Answers
Some of the bacteria have capability to lyses red blood cell and degrade the hemoglobin by the exoenzymes which they produce. Hemolysis can be done in different way.
Alpha hemolysin,beta hemolysin,and gamma hemolysin.
Alpha hemolysin does not breakdown the red blood cell completely but partially breakdown occurs and this causes a greenish color around the colonies. Greenish color is caused by the byproduct formation of the breakdown of hemoglobin. Biliverdin is a byproduct forms there.
.
Staphylococcus aureus which is a skin resident flora shows this alpha hemolysin with greenish color.
In Beta hemolysin, complete breakdown of red blood cells and hemoglobin occurs. So no byproduct is formed there. So, this forms a clear zone around the bacterial growth in blood agar plate.
The streptococcus pyrogens breakdown the cell and hemoglobin better in an anaerobic condition.
So, streptococcus pyrogen, which is a skin resident flora shows beta hemolysin and produce clear halo zone.
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you have cultured a throat swab specimen on a blood agar plate. you note the presence...
you have cultured a throat swab specimen on a blood agar plate. you note the presence of a clear halo around the colonies. these bacteria are exhibiting (a) endoenzyme production for hemolysis (b) exoenzyme production for hemolysis (c)exoenzyme production for for iron reduction (d) lactose fermentation (e) mannitol fermentation
When Streptococci spp. are grown on agar containing blood, there are often clear zones around the colonies. This demons...
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...
help please What type(s) of bacteria are favored to grow on eosin methylene blue (EMB) agar?...
help please
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number 2 and 6 0 9 - - - After flood both plates with lodine, they...
number 2 and 6
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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...
help please
What type(s) of bacteria are favored to grow on eosin methylene blue (EMB) agar? Select one: O a Gram positive bacteria that can undergo anaerobic respiration. O b. Gram negative bacteria that can ferment glucose and/ or lactose, O c. Only those bacilli that can utilize citrate as a main carbohydrate source. O d. All Bacteria would grow equally well A bacterial species grows on a MacConkey agar plate, and the colonies have dark red color with hazy...
number 2 and 6
0 9 - - - After flood both plates with lodine, they turned purple. There is a clear zone surrounding the growth of Bacillus on Starch Agar plate but not on the Starch + Glucose Agar Plate. Starch Agar Plate Starch + Glucose Agar Plate Review Questions: 1. Which bacterium hydrolyze starch? A. Bacillus B. E. coli C. both D. neither one __2. Amylase is produced when_ A. Glu (+) Starch (+) B. Glu (+) Starch...
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