A tissue sample is sent to the laboratory and microscopically examined for the presence of amebae. To differentiate between the host cells and the organism, _______ stain is used to allow the organisms to appear bright pink with a green-blue background
a. Trichrome
b. Giemsa
c. Wright's
d. periodic acid–Schiff (PAS)
D
A histologic diagnosis of amebiasis can be made when the trophozoites in the tissue are identi-fied. Organisms must be differentiated from host cells, particularly histiocytes and ganglion cells. PAS staining is often used to help locate the organisms. The organisms will appear bright pink with a green-blue background, depending on the counterstain used.
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Which of the following experiments is the best way to determine if an element is essential for plant growth?
A) Measure the amount of the element stored in plant tissues. B) Measure the amount of the element in the soil after plant growth. C) Measure the weight of the plant and soil before and after plant growth. D) Grow a plant using hydroponics with and without the element.
The two codons for glutamine are CAA and CAG. Which one of the following is likely to be the anticodon of a tRNA that is specific for glutamine?
A. GUC B. CGU C. CUG D. GCU
In Figure 26.09 (above) the animals across are a lancelet, lamprey, salmon, lizard, and rabbit. If the salmon, lizard, and rabbit are an ingroup, which animals above would be an outgroup and which characteristics are necessary to be in the ingroup?
A. Lamprey and lancelet; notochord and vertebrae.
B. Lamprey only; vertebrae, hinged jaw, tetrapod, and mammary glands.
C. Lancelet and lamprey; hinged jaw, tetrapod, and mammary glands.
D. Lancelet, lamprey and salmon; hinged jaw, tetrapod, and mammary glands.
E. Lizard and rabbit; tetrapod and mammary glands.
One of the Hardy-Weinberg assumptions states that the population is infinitely large. What influence might a small population size have on a Hardy-Weinberg equilibrium?
What will be an ideal response?