Plastic marine debris was collected from multiple sites in the ocean and examined with electron microscopy and next-generation sequencing. These techniques revealed microbial communities growing on the plastics. Which of the following statements is correct regarding these communities?
A. These communities are very likely to be pure cultures, as plastics have been synthesized precisely because they are resistant to microbial degradation.
B. There are no bacteriophage that use these microbes as hosts, as viruses are rare in marine ecosystems.
C. The community within the plastic must be very similar to the community in the surrounding ocean waters.
D. At least one member of the community must synthesize an enzyme to degrade the hydrocarbon comprising the plastic.
Answer: D
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A. rate of emigration = birth rate x initial population size B. None of the answer choices is correct. C. logistic growth rate = per capita rate of increase x carrying capacity D. number of individuals added during any time interval = per capita rate of increase x initial population size E. carrying capacity = environmental resistance x exponential growth rate
In the ABC model of flower development in
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The pituitary gland is regulated most directly by the:a
pineal gland. b. hypothalamus. c. thymus gland. d. adrenal gland. e. thyroid gland.
A male from one species meets a female from its sister species. They mate but the progeny produced are sterile. This is an example of:
a. reproductive character displacement. b. a hybrid zone. c. prezygotic isolation. d. postzygotic isolation.