A group of chemicals that at low doses reduces
fatigue and heightens awareness but at high doses
elicits anxiety and irritability are
a. depressants.
b. stimulants.
c. analgesics.
d. hallucinogens.
e. antipsychotics.
Answer: b
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The scientist who received the first Nobel Prize in Medicine for his work on antibody therapy was
A. Koch. B. von Behring. C. Jenner. D. Roux.
Having various types of chlorophylls and accessory pigments for the photosynthetic process
A) allows for a variation in color among plants. B) allows many wavelengths of light to be captured to provide energy for photosynthesis. C) allows light to be harvested specifically in a stepwise manner. D) shifts the equilibrium of photosynthesis toward the formation of products. E) increases the efficiency of the Calvin cycle.
Endomycorrhizal fungi penetrate the plasma membranes of root cells
____________________ Indicate whether the statement is true or false.
Traditional classifications tended to take into account primarily
a. extinct organisms b. RNA similarities c. DNA similarities d. general similarities in appearance