A scientist is studying several areas along an elevation gradient. Her study involves prescribed burns (purposefully set, low-intensity fires) in the different areas, followed by a comparison of the type and abundance of organisms that colonize them over the next ten years. What scale best describes her study?
A. Ecosystem ecology
B. Population ecology
C. Physiological ecology
D. Community ecology
E. Organismal ecology
Answer: D
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The major excretory organ(s) of the human urinary system is/are the
A. gallbladder. B. pancreas. C. liver. D. adrenal gland. E. kidneys.
Conjugative transposons ________.
A. often express enzymes that degrade aromatic compounds B. can be transferred from one bacterium to another by a phage-mediated process C. may be involved in the spread of antibiotic resistance in bacteria D. All of the choices are correct.
The form of botulism known as (foodborne/infant/wound) is an intoxication disorder
What will be an ideal response?
During the production of vaccines, which of the following is NOT a measure taken to reduce the risk that the vaccine will cause an infection or other adverse reactions?
a. converting exotoxins to toxoids b. killing pathogens with heat c. diluting pathogen concentrations so they are less virulent d. killing pathogens with phenol