Of the following major groups of animals, which is the only group with radical symmetry?
a) arthropods
b) flatworms
c) mollusks
d) cnidarians
Answer: d) cnidarians
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Chemosynthetic bacteria are unique:
a. in not requiring CO2. b. because they use energy derived from chemicals. c. because they can produce food with low light. d. and are very common in the twilight depths. e. because many forms are also bioluminescent.
After a trip to several South American countries, a middle-aged man becomes ill. He becomes anemic, loses weight, and runs a fever. The clinician notes a recently healed sore near his nose. Microscopic examination of a blood smear does not reveal anything other than the anemia. What parasitic infection is consistent with this scenario?
A) malaria B) leishmaniasis C) Chagas' disease D) giardiasis E) balantidiasis
What type of plant would be least affected by the loss of the guard cell function that closes stomata?
A. a carnivorous plant B. a desert plant C. a rainforest plant D. a plant from the plains of the American midwest E. a poisonous plant
Meningococcal meningitis is typically acquired through the
A. genitourinary tract. B. respiratory tract. C. gastrointestinal tract. D. skin.