... ;composed of hyaluronic acid and are beta-hemolytic, which is true for streptococcus pyogenes"(Todar). "Beta-hemolytic streptococci produce a toxin that forms a clear zone of hemolysis on blood agar, demonstrating its ability to destroy red blood cells" (Charlotte). This hemolysis contribute the the toxins formed by Group A streptococci called streptolysins. "Streptolysins can destroy not only red blood ... ...

• Word Count: 1124
• Approx Pages: 4
• Has Bibliography
• Grade Level: Undergraduate

... growth has been inhibited. The size of this zone of inhibition depends on the sensitivity of the bacteria to the specific antibiotic and the antibiotic's ability to diffuse through the agar. After 18 hours of incubation at 35oC, the clear zones are measured. In order to determine if an antibiotic will be effective in treating the bacterial infection, the zone of ... ...

• Word Count: 423
• Approx Pages: 2
• Grade Level: Undergraduate

... -carotene, lutein, and zeaxanthin. All red algae reproduce sexually; a female egg is fertilized by a male sperm. It is not unusual for red algae to alternate between diploid and haploid generations. Agar, which is used to grow colonies of microorganisms, is extracted from rhodophytes; agarose is extracted from Gracilaria (Margulis 1998). Phylum Gamophyta Gamophytes are green algae that reproduce sexually, although they ... ...

• Word Count: 3806
• Approx Pages: 15
• Grade Level: Undergraduate