Those dinoflagellates that live in an intimate association with corals are called
A. lichens.
B. zooxanthellae.
C. phytoplankton.
D. parasites.
Answer: B
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When submerged, frogs receive most of their O2 from capillaries within the skin. What structure would contain blood with the highest O2 concentration in a submerged frog, which is not able to breathe using its lungs?
A. left atrium B. ventricle C. right atrium D. pulmonary vein E. aorta
The best way to directly observe Treponema pallidum is through ________ microscopy.
A. bright-field B. scanning electron C. dark-field D. phase contrast E. fluorescent
During the human female sexual response, the sympathetic system causes
a) vasocongestion of the vagina b) vasocongestion of the clitoris c) reduction of the circumference of the vagina d) lifting of the cervix e) the sympathetic does not cause any of the above
A reservoir is
A) a source of microbial contamination. B) an environment that is free of microbes. C) any microorganism that causes disease. D) a condition in which organisms remain in the body for a short time. E) a source of microbes for laboratory testing.