Which of the following statements is true concerning dark-field microscopy?
a. This type of microscopy uses specific stains to enhance the contrast of certain bacteria.
b. The condenser does not allow light to pass directly through the specimen but directs the light to hit the specimen at an oblique angle.
c. Dark-field microscopy allows the visuali-zation of larger viruses.
d. Dark-field microscopy can differentiate various difficult-to-grow organisms by using immunofluorescence.
B
Dark-field microscopy does not allow light to pass directly through the specimen but directs light to hit at an oblique angle thus making the background a dark field.
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The Ecdysozoa include (select all that apply)
A. annelid worms B. mollulsks C. sea anemones D. arthropods E. vertebrates
The exchange surfaces of fish gills are arranged as rows of
A. lamellae. B. trachea. C. alveoli. D. parabronchi. E. spiracles.
Which of the following choices is not an effect of cortisol?
a. controls sodium and water reabsorption in the kidneys b. signals skeletal muscles to degrade proteins c. induces liver cells to break down glycogen d. triggers adipose cells to degrade fats
A special capsule or chamber where a plant will make the first cells of the gametophyte generation is
called a ____.
a. vascular system b. protonema c. sporangium d. rhizome e. shoot system