For two types of organisms to belong to the same species, they must
A. look alike.
B. live in the same geographic region.
C. be able to naturally produce fertile offspring.
D. contain the same gene frequencies.
C. be able to naturally produce fertile offspring.
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Listeriosis is diagnosed from ________ cultures and treated with ________
A) sputum / intravenous antibiotics B) blood or spinal fluid / hydration therapy C) sputum / hydration therapy D) blood or spinal fluid / intravenous antibiotics
A student complains that it makes no sense to worry about coliform bacteria in water, since we naturally possess harmless coliforms in our intestines anyway. Why do regulatory agencies worry about coliform bacteria in water supplies, then?
A. The coliforms in our intestines can sometimes turn harmful, causing intestinal infections. We need to constantly be on guard against this happening. Coliforms in water might add to this potential problem. B. Not all coliforms are harmless and symbiotic with human beings. Some may carry genes/proteins that can make them dangerous to humans. It's best to keep coliforms OUT of our drinking water, since it's difficult to identify which ones might be harmless and which ones might be harmful. C. Regulatory agencies are worried that multiple types of coliforms in water might lead to greater antibiotic resistance in the bacterial populations. They try to keep them out of water to keep antibiotic resistance levels down. D. Regulatory agencies simply need something to do to justify their existence. There is no real danger from coliforms in water supplies.
What does a "run of homozygosity" indicate?
A) A recent common ancestor B) An ancient common ancestor C) Consanguineous ancestry D) Nondisjunction in a parent
Species richness refers specifically to
a. the numbers of individuals of each species present. b. the ability of larger animals to enrich themselves by successfully preying on smaller ones. c. the number of different species in the habitat. d. the feeding levels at which the animals are located. e. none of these.