The structure of interleukin-2 includes which of the following?
A) four helical segments
B) only b-pleated sheet
C) both a-helix and b-pleated sheet
D) four cysteine residues which form two disulfide bridges
A
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In the United States, oil production is ________ oil consumption
A) significantly less than B) slightly greater than C) significantly greater than D) slightly less than E) equal to
What has been identified as one of the five major causes of the environmental problems we face?
A. Perverse subsidies B. Hazardous waste C. Ignorance D. Corruption E. Poverty
What is the retail margin for clothing made in China and sold in the U.S. or Europe?
A) 400-500% B) 200-300% C) 95-150% D) 75% E) none of the above
What typically happens when tributaries join the main river?
A) Channel size increases
B) Water velocity increases
C) The amount of discharge increases
D) Total sediment load increases
E) All of these are correct.