You are studying the bacteria in the water of a nearby pond. From a 100 mL sample, you use a 0.5 mL subsample to inoculate a plastic dish filled with a semisolid nutrient medium that fosters growth of coliform bacteria. After an appropriate incubation period, you count 100 bacterial colonies growing on the surface of the medium. What conclusion can you make about the coliform bacteria in the pond water?
A. There is approximately one coliform bacterial cell per milliliter.
B. There are approximately 200 coliform bacterial cells per milliliter.
C. There is approximately one coliform bacterial species per milliliter.
D. There are approximately 200 coliform bacterial species per milliliter.
B. There are approximately 200 coliform bacterial cells per milliliter.
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What best describes the location where sexual spores form in club fungi?
a. in gills of the mushroom b. in club-shaped cells at the gill margin c. in fruiting bodies d. in club-shaped cells of mycelium e. in hyphae of an embryonic mushroom
You conduct an experiment in which you add increasing amounts of substrate to an enzyme solution and then measure
the resulting reaction rate. You plot the rate of the reaction on the Y-axis versus substrate concentration on the X-axis. What do you conclude from your graph? a. The reaction rate is independent of substrate concentration. b. The reaction rate decreases with increasing substrate concentration. c. The reaction rate is directly proportional to substrate concentration. d. The reaction rate increases but then decreases, forming a bell-shaped curve. e. The reaction rate increases with increasing substrate concentration up to a point, above which the rate remains constant.
Which of the following statements about Neisseria gonorrhoeae is FALSE?
A. It causes disease in humans only. B. The gonococci stick to epithelial cells via fimbriae and capsules. C. The gonococci secrete a protease that destroys secretory IgA. D. The gonococci induce lasting immunity. E. Infected women are often asymptomatic.
Anoxic oxidation of ammonia occurs within membrane-enclosed ________ compartments within cells
a. reaction center b. carboxysome c. heterocyst d. anammoxosome