Crab spiders can be found sitting on top of flowers in fields. They are easily visible on warm
sunny days. This is an example of an organism’s __________.
a. microhabitat
b. macrohabitat
c. niche
d. life zone
A
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Motor neurons release the neurotransmitter acetylcholine (ACh) and acetylcholinesterase degrades ACh in the synapse. If a neurophysiologist applies onchidal (a naturally occurring acetylcholinesterase inhibitor produced by the mollusc Onchidella binneyi)
A) paralysis of muscle tissue B) gradual loss of resting potential C) convulsions due to constant muscle stimulation D) decrease in the frequency of action potentials E) no effect
The molecule that functions as a corepressor for the trp operon is
A. glucose. B. cAMP. C. tryptophan. D. CAP. E. lactose.
Which of the following groups can be
distinguished from other arthropods by its two pairs of antennae? a. insects b. millipedes c. chelicerates d. crustaceans e. trilobites
What tissue in the gastrula gives rise to muscle?
A) ectoderm B) mesoderm C) endoderm D) gastrula