Which of the following is microscopy in which the microscope is fitted with light filters that enable the excitation of the specimen with a specific wavelength?
A. Bright-field microscopy
B. Dark-field microscopy
C. Epifluorescence microscopy
D. Electron microscopy
Answer: C
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The two main types of eukaryotic microtubules are the ________ and ________ microtubules
Fill in the blank(s) with the appropriate word(s).
Which of the following is true concerning the pathogen that causes tetanus?
a. The bacteria are airborne. b. The bacteria are spread by respiration. c. The pathogen is a virus. d. The bacteria tend to colonize wounds. e. The toxin produced by the pathogen prevents muscle contraction.
Since mice embryos with loss-of-function Hox mutations result in homeotic alterations, then introduction of such a mutation might cause __________
A) ribs on normally rib-less vertebrae B) pointed rather than rounded ears C) a change in fur coloration along the dorsal midline D) behavioral alterations causing limb shaking E) paralysis of hindlimbs but not forelimbs
In birds, after fertilization but prior to the emergence of the chicks, the development of the fertilized egg is:
a. dimorphic. b. internal. c. ignored by both parents. d. external. e. variable.