Which molecule is the major excitatory neurotransmitter in the brain?
a. GABA
b. glutamate
c. serotonin
d. dopamine
e. acetylcholine
b
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Which of the following would work as an antidote for someone who was bitten by a black
widow spider?
a. a drug that blocks the sodium–potassium pump b. a drug that causes potassium gates to open c. a drug that blocks acetylcholine binding sites d. a drug that stimulates the release of calcium
For a neuron at rest, there is a higher concentration of ____ outside the cell than inside
a. Na+ b. K+ c. Ca2+ d. anions e. ATP
If you provided your shade-tolerant plants with their preferred wavelength of light, but only minimal amounts of water, which of the following would you expect to occur?
A) increased plant growth B) increased amounts of oxygen released by the plants C) decreased amounts of ATP being produced by the plants D) increased growth of the plants' leaves
________ cells lack cytoplasm at maturity, are tough and thick-walled, and serve to strengthen tissues.
A. Meristem B. Parenchyma C. Sclerenchyma D. Collenchyma