The biological species concept:
A. states that any organisms that are biologically similar constitute a species.
B. states that a species is any group that shares similar DNA.
C. is the best and most accurate species concept.
D. defines a species as any group of actually or potentially interbreeding species that produce viable offspring.
Answer: D. defines a species as any group of actually or potentially interbreeding species that produce viable offspring.
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All microorganisms require
A) carbon, iron, and sodium. B) phosphorus, aluminum, and sodium. C) calcium, potassium, and magnesium. D) phosphorus, selenium, and sulfur.
A pharmaceutical company is researching potential drugs that would allow patients to grow stronger nails and hair. The company is considering the purchase of a patent for a molecule that has been shown to significantly accelerate the growth of microtubules in eukaryotic cells and has hired you as a consultant before patent negotiations have begun. What advice should you give?
a. The company should not purchase this patent because the rate at which microtubules grow is inversely proportional to their overall strength. b. The company should not purchase this patent because it is extraordinarily unlikely that the results will transfer to prokaryotic cells. c. The company should not purchase this patent because keratin fibers are not microtubules but rather intermediate filaments. d. The company should purchase this patent because microtubule growth is the largest inhibiting factor for nail and hair strength.
If two continents converge and are united, then the collision should cause
A. a net loss of intertidal zone and coastal habitat. B. the extinction of any species adapted to intertidal and coastal habitats. C. a decrease in climatic extremes in the interior of the new supercontinent. D. an overall decrease in the surface area located in the continental interior.
Bony fishes possess a swim bladder to
A. regulate their buoyancy. B. detect changes in water pressure. C. cleanse the blood of toxins. D. store urine until excreted. E. regulate oxygen concentrations in their blood.