__________ is an anticoagulant used by leeches
A. Chitin
B. Calcium carbonate
C. Hirudin
D. Pheromone
E. Saxitoxin
C
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If a drug binds irreversibly to a postsynaptic receptor to prevent the binding of an excitatory neurotransmitter, what is
the most likely result?
a. an increased number of IPSPs b. an increased number of EPSPs c. a prolonged hyperpolarization d. a decreased number of IPSPs e. a decreased number of EPSPs
An animal with a gastrointestinal tract is the ___________.
A. jellyfish B. planarian C. hydra D. sponge E. earthworm
What occurs within the female cone of a pine tree?
a. meiosis b. mitosis c. development d. fertilization e. all of these
Microorganisms require large quantities of this nutrient for use in cell structure and metabolism:
A. element B. macronutrient C. water D. growth factor E. trace element