The following are all main points about toxic fish poisoning except:
a. ciguatera poisoning is not usually fatal.
b. ciguatera is due to blooms of dinoflagellates.
c. puffer fish poisoning can be fatal.
d. there are safe and effective antidotes for ciguatera poisoning.
D
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Two tubes are inoculated from one test tube of a bacterial culture. The cultures are then transferred every day for 2 months. All of the media and growth conditions are the same in every tube
After 2 months of cultivation, the fitness and genotype frequencies of the populations in the two tubes are compared. The fitness of the two cultures is the same, but the genotype frequencies are very different in the two cultures. How is this possible? A) Two months is not long enough for different fitness levels to evolve even if the genotype frequencies change. B) This result is not possible because different genotype frequencies would result in different fitness levels under the same growth conditions. C) Natural selection caused the evolution of different genotype frequencies within the separate test tubes. D) Genetic drift within the small populations in the test tubes resulted in different genotype frequencies.
The best anticoagulant to prevent clotting of specimens, such as blood, bone marrow, and synovial fluid, which are submitted for recovery of all types of microorganisms, is:
a. sodium polyanethol sulfonate (SPS). b. heparin. c. citrate. d. ethylenediaminetetraacetic acid (EDTA).
Because enzymes affect the speed of chemical reactions without being consumed, they are referred toas:a
hydrogen acceptors. b. activation energy. c. catalysts. d. cytochromes. e. transformation proteins.
Refer to the accompanying figure. If you treated this organelle to remove ONLY the chlorophyll, which label indicates the portion of the organelle that would be most directly affected by this treatment?
a. A
b. B
c. C
d. D
e. E