Parkinson's disease is associated with a deficiency in
A) dopamine.
B) serotonin.
C) acetylcholine.
D) endorphins.
Answer: A
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Peripheral shadows or flashes of light can be a sign that the retina is peeling away from the layer below. Why is detachment of the retina a medical emergency?
A. It contains the photoreceptor cells that respond to light. B. It is crucial for focusing the image. C. It secretes tears that bathe and protect the eyeball. D. It is a sphincter muscle that controls light transmission. 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 the retina? 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?
What drives the process of transpiration?
a. upward pressure as sugar is forced into the roots b. evaporation c. pumping by the xylem cells d. passive transport
Why aren't ferns commonly found in deserts?
A. Fern spores are unable to resist prolonged dry conditions. B. Fern fronds are sensitive to UV light. C. Fern pollen is spread by insects that do not occur in deserts. D. Ferns are nonvascular and cannot absorb water from deep within the soil.
Cells make use of H+ electrochemical gradients in many ways. Which of the following proton transporters is used to regulate pH in animal cells?
(a) light-driven pump (b) H+ ATPase (c) H+ symporter (d) Na+-H+ exchanger