Regions above or below the optimal range of an environmental variable are called:
a. zones of stress.
b. tolerance zones.
c. optimal range areas.
d. None of the above.
e. b and c only.
A
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Choose the defining characteristic of all arteries.
A. They only carry oxygenated blood. B. They only carry blood away from the heart. C. They only carry blood back to the heart. D. They only carry deoxygenated blood.
The _____ are two saclike structures that lie above the prostate, behind the bladder, and in front of the rectum in human males.
A. kidneys B. seminal vesicles C. ovaries D. Bartholin glands
Some viruses cause disease; they act as __________ in humans.
Fill in the blank(s) with the appropriate word(s).
Clinical sensitivity in the microbiology laboratory refers to:
a. positive results from patients known to have an infection or disease. b. percentage of positive results from all pa-tients tested. c. percentage of patient's that test negative known to have an infection or disease. d. none of the above answers are correct.