Which microscope does not use light in forming the specimen image?
A. phase-contrast
B. fluorescence
C. dark-field
D. bright-field
E. electron
Answer: E
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Matching. Choose the most appropriate answer for
each. 1. ___ millipede 2. ___ annelids 3. ___ arthropods 4. ___ placozoan 5. ___ cnidarians 6. ___ echinoderms 7. ___ flatworms 8. ___ rotifers 9. ___ mollusks 10. ___ roundworms 11. ___ sponges A. two pairs of legs per segment B. tiny, flattened, crawling forms C. planarians, flukes, tapeworms D. nematodes E. snails, squids, clams F. wheel animals G. flagellated collar cells present H. jellyfish and corals I. crustaceans, ticks, and insects J. polychaetes, earthworms, leeches K. sea urchins, sea stars
The term that is synonymous with a motor neuron is a(n) ____ neuron
a. input b. afferent c. efferent d. ganglia e. peripheral
________ forms the embryonic structures that later become bone
Fill in the blank(s) with correct word
A distinctive feature of eukaryotes is the organization of tightly packaged chromosomal DNA with proteins into a membrane-bound structure called a:
A. nucleus. B. cell. C. plasma membrane. D. nucleolus.