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
Answer: C
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An alien from another planet landed on earth. He is fascinated by cars and is determined to figure out how they work. He decides to disassemble one of them and examine each part independently. He removes one of the tires and proceeds to learn all he can about the tire. He then removes one of the headlights and proceeds to learn all he can about the headlight. What type of approach is this alien
taking to learn about the car? A. reductionism B. Emergent properties C. inductive reasoning D. deductive reasoning
Genetic recombination as a result of crossing
over occurs more readily in genes
a. that are on the sex chromosomes. b. that are on the autosomes. c. that are located close together on the same chromosome. d. that are located far apart on the same chromosome. e. that are located on different chromosomes.
In the heart of Costa Rica there's a private reserve called Rara Avis. Here, one can hike high into the mountains of a tropical cloud forest to take guided nature hikes and learn about this unique ecosystem
What principle applies to this tactic of habitat preservation? A) critical habitat designation B) ecotourism C) regulations D) exploitation
If oxygen were present in the Earth's primitive atmosphere, then according to one hypothesis
A. the processes leading to the origin of life would occur. B. organic molecules could not form from inorganic molecules. C. reduction reactions would have been possible. D. None of these answers is correct.