Some insecticides interfere with the removal of acetylcholine from the synaptic cleft. What effect will this have on muscle contraction?
A) The muscle cell will lose all of its supply of calcium.
B) The muscle cell will be unable to be stimulated again.
C) The muscle cell will be in a state of constant stimulation, leading to a tetany response.
D) The muscle cell will have a single twitch and will be unable to contract again.
C
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The most precise method of obtaining estimates of the absolute ages of geological deposits is
A. measure rates of sedimentary rock formation. B. measure the ratios of various radioactive isotopes in the deposits. C. apply the principle of superposition (younger deposits above older deposits). D. make salinity measurements in ocean sediment deposits. E. study the sequence of fossil types in the deposits.
Pinpointing the location and size of tumors can be accomplished through ____
a. DNA probes b. biopsy c. x-rays d. MRI e. radioactive monoclonal antibodies
Order ____ includes the snakes
a. Apoda b. Chelonia c. Aves d. Squamata e. Reptilia
What is the purpose of accessory pigments, such as carotenoids, in photosynthesis?
What will be an ideal response?