The inherited mechanisms that protect the body from pathogens are called ____
a. the immune system
b. vaccination
c. restriction endonucleases
d. the pathogen defense system
e. immunological tolerance
ANSWER: 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
For the process of diffusion to occur, molecules must
A. move from areas of high concentration to areas of lesser concentration until an equilibrium is reached. B. move from areas of low concentration to areas of higher concentration until an equilibrium is reached. C. remain stationary until their molecular motion allows for an equilibrium to be reached. D. move from areas of high concentration to areas of lesser concentration until facilitated transport can assist the molecular equilibrium. E. move from areas of high concentration to areas of lesser concentration until an equilibrium is reached by active transport.
This structure allows skates and rays to breath while at rest
a. Placoid scales b. Spiracles c. Gill slits d. Spicules
Earth's axis is tilted away from the sun during ________ and toward the sun during ________ in the Northern Hemisphere
A) winter; summer B) summer; winter C) spring; fall D) fall; spring