__________ is an anticoagulant used by leeches

A. Chitin
B. Calcium carbonate
C. Hirudin
D. Pheromone
E. Saxitoxin


C

Biology & Microbiology

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What occurs within the female cone of a pine tree?

a. meiosis b. mitosis c. development d. fertilization e. all of these

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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

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An animal with a gastrointestinal tract is the ___________. 

A. jellyfish B. planarian C. hydra D. sponge E. earthworm

Biology & Microbiology

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

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