The photograph above of the aphid and the wasp is an example of ____
a. mimicry
b. display behavior
c. warning coloration
d. chemical defenses
e. biological control of pests
ANSWER: e
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The life-cycle stages of the intestinal trematodes after the eggs are shed from the body via feces are best described as:
a. cercariae, miracidium larva, metacercariae, and redia. b. redia, metacercariae, cercariae, and mira-cidium larva. c. miracidium larva, redia, cercariae, and metacercariae. d. metacercariae, miracidium larva, cercariae, and redia.
An ecologist who studies the cycling of nutrients and the flow of energy between the biotic and abiotic components of
an ecological community is a(n) ____ ecologist.
a. behavioral b. behavioral c. community d. ecosystem e. organismal
A nursing student develops a positive reaction to the tuberculin skin test. A history reveals possible exposure to patients with tuberculosis. A sputum sample is acid-fast negative. When asked for vaccination records, the student reports that childhood
vaccination records were lost when the family emigrated from a Southeast Asian country. What is the best explanation for the test results? A) The student has been infected with Mycobacterium tuberculosis. B) The student has been exposed to Mycobacterium tuberculosis. C) The student is not infected. D) The student has been exposed to Mycobacterium tuberculosis or was vaccinated with BCG vaccine. E) No conclusion is possible with the information provided.
Acid-fast organisms such as Mycobacterium tuberculosis contain ________ constructed from mycolic acids in their cell walls.
A. proteins B. lipids C. carbohydrates D. peptidoglycan