Blood returning to the left atrium of a frog heart has just come from ________.
A. the brain or the skin
B. the skin only
C. the lungs or the skin
D. the lungs or the brain
E. the brain only
F. the lungs only
Answer: C
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A patient was suspected of having a rickettsial infection after hiking in the Rocky Mountains. A Weil-Felix test was performed, which resulted in no agglutination observed. Which one of the following statements explains this discrepancy?
a. Detection of rickettsial infections using strains of Proteus is not as specific as other serologic tests; therefore the infec-tions should be retested with a newer me-thod. b. The Weil-Felix test is not the appropriate test to order; it cannot detect cross-reacting antibodies. c. Rickettsial antibodies should be tested using the fluorescent treponemal antibody absorption (FTA-ABS) test, not the Weil-Felix test. d. No discrepancy is present. Rickettsial an-tibodies do not agglutinate with Proteus antigens.
Which of the following is not important in determining the distribution of organisms in aquatic
biomes? a. light penetration b. mineral nutrient concentrations c. precipitation d. salinity e. temperature
A consequence of the way hormones, as compared to neurotransmitters, get to their target cells is that hormones:
A) cannot maintain homeostasis. B) must be larger molecules. C) would be slower to act. D) must be proteins. E) can be lipids.
The alveolates with two different nuclei are ciliates.
Answer the following statement true (T) or false (F)