Which of the following substances is secreted by an endocrine gland?
a. Tears
b. Breast milk
c. Wax
d. Saliva
e. Hormones
e
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A certain cell type has existed in the blood and tissue of its vertebrate host's immune system for over twenty years. One day, it recognizes a newly arrived antigen and binds to it, subsequently triggering a secondary immune response in the body
Which of the following cell types most accurately describes this cell? A) plasma cell B) thyroid cell C) memory cell D) macrophage
Urea agar is set up for quality control purposes using two Trichophyton spp.—T. mentagrophytes and T. rubrum. After the appropriate amount of incubation, both organisms are negative. Which one of the following statements explains this discrepancy?
a. The medium is most likely expired. b. These two Trichophyton spp. are poor choices for quality control. c. The phenol red indicator is not working because both organisms are positive for urea. d. No discrepancy is present; both organisms are negative for urease activity.
Negative staining facilitates the visualization of bacterial capsules that are intensely stained by the procedure.
Answer the following statement true (T) or false (F)
When you sit quietly on the couch and read, output from the _____ system prevails
a. sympathetic c. both prevail b. parasympathetic d. neither prevails