A student performed the modified use-dilution test described in this exercise, after incubation the nutrient broth appeared cloudy. What does this mean?
A) The disinfectant was effective at killing all the bacterial cells on the washer
B) The disinfectant was not effective at killing all the bacterial cells on the washer
B) The disinfectant was not effective at killing all the bacterial cells on the washer
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In the mechanics of conjugation, exclusive of gene transfer, Hfr and F+ strains behave the same.
Answer the following statement true (T) or false (F)
Which of the following is the main form of nitrogenous wastes released by birds to their environment?
a. nitrate b. ammonia c. uric acid d. amino acids e. urea
hemoglobin?
a. It is a protein. b. It contains iron. c. It has the same function in mollusks, annelids, and some crustaceans as it has in humans. d. Clams, like humans, carry hemoglobin in red blood cells. e. It is comparable in function to hemocyanin
In the kidney, the collecting ducts from the nephrons empty immediately into the
a. renal cortex. b. renal medulla. c. renal pelvis. d. ureter. e. urethra.