Naegleria fowleri meningoencephalitis is commonly acquired by
A) exposure to bird droppings.
B) mosquito bites.
C) swimming in warm ponds or streams.
D) ingestion of water contaminated with fecal material.
E) exposure to body fluids of a contaminated individual.
C
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You are a parasitologist interested in roundworms affecting wolves. If you know two populations of wolves were separated long enough ago for them to speciate, would you expect their roundworms (derived from a common ancestor) to speciate as well?
What is this process called? A. yes; allopatric speciation B. yes; co-speciation C. no; dispersal D. no; natural selection
If many human genes differ in about 10% of their bases from another species' same genes and substitutions occur at an estimated rate of 2% per 1 million years, then about million years have passed since the two species diverged.
A. 20 B. 200,000 C. 3 D. 10 E. 5
Osmotic concentration in the loop of Henle increases as NaCl as water moves out.
a. true b. false
Many plants are totipotent, which means
A. each cell of the plant has the genetic capability of developing into an entire plant. B. they are capable of providing their own nutrition, requiring no external nutritional sources. C. they are incapable of dividing to produce daughter cells. D. they are metabolically inactive, existing in a state of dormancy.