The primary stain used in the technique shown in Image A is:
a) Aldehyde fuchsin
b) Carbol-fuchsin
c) Leucofuchsin
d) Acid fuchsin
Ans: b) Carbol-fuchsin
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Circulatory systems compensate for _____
A) temperature differences between the lungs and the active tissue B) the slow rate at which diffusion occurs over large distances C) the problem of communication systems involving only the nervous system D) the need to cushion animals from trauma E) the need that fetal organisms have for maintaining an optimal body temperature
Measurements of bill length in a population of seed-eating birds reveals two distinct groups: small-billed individuals feeding on soft-shelled seeds and large-billed individuals feeding on hard-shelled seeds
This bimodal distribution most likely resulted from A) stabilizing selection. B) natural selection. C) directional selection. D) disruptive selection.
Refer to Figure 40-1. Which of the following structures contributes to protecting the skin from the
effects of UV irradiation? a. 3 b. 5 c. 7 d. 10 e. 11
Organisms demonstrated by the technique shown in Image A belong to the group known as:
a) Spirochetes b) Bacilli c) Mycobacteria d) Fungi