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 be unable to be stimulated again.
B) The muscle cell will be in a state of constant stimulation, leading to a tetany response.
C) The muscle cell will lose all of its supply of calcium.
D) The muscle cell will have a single twitch and will be unable to contract again.
Answer: B
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Large amounts of epithelial cells, many of which are covered by tiny gram-variable rods and coccobacilli, and the absence of inflammatory cells in vaginal discharge are signs of:
a. pelvic inflammatory disease (PID). b. bartholinitis. c. cervicitis. d. bacterial vaginosis.
What is the likely outcome if you were able to force water through fish gills in the opposite direction to how it normally flows over the gills?
A. There would be no effect, and maximal oxygenation of blood would still occur. B. The direction of blood flow would reverse through the gills to compensate for the reversed direction of water flow. C. Gas exchange would be inhibited and movement of oxygen into the blood would cease. D. The movement of carbon dioxide from the blood into the water would increase. E. The blood's oxygen concentration would not be able to exceed 50%. Clarify Question What is the key concept addressed by the question? What type of thinking is required? Gather Content What do you already know about fish gills? What other information is related to the question? Choose Answer Given what you now know, what information is most likely to produce the correct answer? Reflect on Process Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
Messenger RNA molecules that direct the synthesis of more than one polypeptide are said to be ________.
Fill in the blank(s) with the appropriate word(s).
Trees are among the largest and oldest living things on Earth. Like all life on Earth, the majority of a tree's biomass is carbon based. What is the source of this carbon?
A) Crushed rock and water B) Fertilizers C) The organic layer of the soil D) Air E) Water