How is fermentation of lactose detected?
a. The medium become turbid when exposed to air.
b. The acetoin produced turns the medium pink.
c. The drop in pH turns the indicator dye yellow.
d. The cells form a black precipitant.
Answer: c. The drop in pH turns the indicator dye yellow.
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A. Organic acids and alcohols B. CO2 C. O2 D. Elemental sulfur or sulfate
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A. labia majora and scrotum B. labia minora and urethra C. clitoris and penis D. cervix and ejaculatory duct E. All of these pairs share a common embryonic origin.
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A. Mycobacterium leprae B. Clostridium perfringens C. Staphylococcus epidermidis D. Neisseria gonorrhoeae