Which of the following statements concerning tetanus is FALSE?
A. Its only source is from deep puncture wounds from rusty nails.
B. Its toxin causes simultaneous contraction of both muscles in an antagonistic pair.
C. It is a small, motile, obligate anaerobe.
D. It produces a terminal endospore that gives the cell a distinctive "lollipop" appearance.
E. Its diagnostic feature is characteristic muscle contractions, which are often noted too late to save the patient.
Answer: A
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Bacteria able to perform the NH4+ + NO2- ? N2 + 2H2O reaction have been discovered in laboratory bioreactors and wastewater treatment systems. Researchers predicted that these bacteria should exist in oceans
They measured the concentration of NH4+, NO2-, NO3-, and O2 in the Black Sea as a function of water depth (M. Kuypers et al. 2003 Anaerobic ammonium oxidation by anammox bacteria in the Black Sea. Nature 422:608-11 ) to determine where in the sea the bacteria might live. Analyzing data presented in the figure above, at what depth would you expect to find the bacteria? (Note: In the figure, different scales are used to show concentrations of NH4+, NO2-, NO3-, and O2.) A) in the top 50 meters B) at a depth of 75 meters C) at a depth of 92 meters D) below 100 meters
A ________ species is fundamentally essential to an ecosystem; its loss changes the structure of the entire community, even though it may only represent a small portion of the population
A) rivet B) keystone C) redundant D) footprint E) baseline
Which of the following has NOT been a basis for classification of the protozoa?
A) means of locomotion B) genetic sequences C) photosynthetic ability D) habitat E) ability to form a dormant stage
Exotic, or introduced, species can permanently disrupt native communities when they ________
a. destroy crops or natural vegetation used by other species b. all of the choices c. prey on community members and depress their numbers d. outcompete native species for access to space, light, or nutrients