Of the 20 amino acids found in human proteins, how many are essential amino acids?
A) 5
B) 10
C) 15
D) 20
B
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Many proponents of sustainability believe that encouraging local self?sufficiency is important for building sustainable societies because ________
A) when people are tied more closely to the area they live in, they will value the area more and seek to sustain its environment and its human communities B) this is not correct; proponents of sustainability believe that encouraging local self?sufficiency will pose a threat to building sustainable societies C) it forces citizens to look more closely at the global community D) it eliminates governmental influence on local practices E) more and more people are growing gardens
Which below best describes the solute effect?
a. keeps water droplets from freezing at temperatures below 32°F b. removal of pollutants from the atmosphere by cloud droplets c. water droplets dissolve hygroscopic nuclei and condensation can occur at relative humidities less than 100 percent d. evaporation of cloud droplets and growing of ice crystals in a cold cloud e. condensation occurs at relative humidities of 100 percent
Cold currents flowing ________ on the ________ sides of continents produce arid conditions
A) poleward; eastern B) poleward; western C) toward the equator; eastern D) toward the equator; western
A low pH, such as 2, means
A. a low concentration of hydrogen ions. B. basic conditions. C. a high concentration of hydrogen ions. D. alkaline conditions.