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

Biology & Microbiology

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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).

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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.

Biology & Microbiology

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

Biology & Microbiology

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.

Biology & Microbiology