Of the different types of staining and microscopic techniques, which one of the following is basically the most sensitive?
a. Chromogenic
b. Fluorescence
c. Phase contrast
d. Light field
B
Fluorescence makes the object appear bright against a dark background, making it easier to see on low magnifications.
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Movement in bacteria
A. is directly to or away from a stimulus. B. relies on the beating of cilia. C. is often referred to as run and tumble. D. may involve pili. E. is often referred to as run and tumble AND may involve pili.
Which is NOT a shared characteristic of
parabasalids and diplomonads? a. heterotrophy b. flagella c. oxygen-poor or anaerobic habitats d. abundant mitochondria e. presence of a pellicle
A researcher is assessing the expression of a certain protein in cells. This protein appears as a "web" in the cytoplasm of cells. The protein is likely a component of:
a. the basal lamina. b. cell junctions. c. All of these choices are correct. d. the extracellular matrix. e. the cytoskeleton.
In the early part of the twentieth century, which of the following two views about the determination of diversity was more popular?
A) Diversity increases without limit over time. B) Diversity reaches an equilibrium level, with factors adding species balanced by factors removing species.