Using the 20 standard amino acids how many dipeptides containing two different amino acids can be made?
A) 20
B) 39
C) 40
D) 380
D
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Another word for cover crops is
A. Mulch B. Shade planting C. Green manure D. Strip farming E. All of these are correct
Which of the following is an incorrect statement about the marine environment?
a) Pressure is generally greater than on land. b) Free oxygen is more abundant than the terrestrial environment. c) Temperatures are more stable than on land. d) Salinity is an issue in the ocean but not on dry land. e) Because of the viscosity difference between water and air, it is much easier for organisms to move through the air.
Which of these pairs of processes, working together, will make the atmosphere most unstable?
A) warm the surface and cool the air aloft B) cool the surface and cool the air aloft C) cool the surface and warm the air aloft D) warm the surface and warm the air aloft
When were wild plants and animals domesticated by native Latin Americans?
A) 10,000 years ago B) 20,000 years ago C) 1,000 years ago D) 5,000 years ago E) 500 years ago