In a protein antigen, how many amino acids are necessary for the antigen to bind to a receptor on a T cell?
A) 1 or 2
B) 3 to 5
C) 5 to 7
D) 10 to 15
D
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The U.S. Department of Agriculture has become increasingly concerned about soil erosion, because expansion of agricultural activities between 1982 and 1992 resulted in sharp increases in rates of soil erosion loss from farmland.
Answer the following statement true (T) or false (F)
If the maximum temperature for a particular day is 26 degrees C and the minimum temperature is 14 degrees C, the daily range would be ________
40 degrees C 20 degrees C 12 degrees C 13 degrees C
Plate tectonics moved continents northward, which may have contributed to an overall cooling of Earth's climate
Indicate whether the statement is true or false
The highest salinity values are found in equatorial oceans
Indicate whether the statement is true or false