The vector involved in African sleeping sickness is the
A. reduviid, "kissing," bug.
B. phlebotomine (sand) fly.
C. hard bodied tick.
D. tsetse fly.
E. Anopheles mosquito.
Answer: D
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Air-breathing insects carry out gas exchange _____
A) in their specialized external gills B) in their specialized internal gills C) in the alveoli of their lungs D) across the finest branches of the trachea and cell membranes E) across all parts of their thin cuticular exoskeleton
An animal has a cardiac output of 40 mL/min (milliliters per minute) and a stroke volume of 5 mL. What is its heart rate?
A) 8 beats/minute B) 200 beats/minute C) 12.5 beats/minute D) Heart rate cannot be determined with only these two variables.
What is the key concept addressed by the question?
What will be an ideal response?
The specimen for an electron microscope is always
A. sliced into thin sections B. viewed directly C. killed. D. stained with dyes.