How many tripeptides can be made using the 20 standard amino acids?
A) 60
B) 400
C) 6840
D) 8000
D
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Agricultural soil erosion affects the amount, but not the fertility, of the soil
Indicate whether the statement is true or false
The most densely populated area of Mexico is the north
Indicate whether the statement is true or false
Convection currents in the atmosphere are driven by
A. The different temperatures and densities of warm and cold air masses B. The surface winds, which in turn are influenced by the Coriolis effect C. The jet stream dipping down into the troposphere D. Bursts of energy emitted by the ionosphere E. Forces that scientists cannot yet explain
One of the difficulties in recycling for materials recovered from municipal refuse is that they may require
A. source separation. B. source provenance. C. source assessment. D. source assimilation.