Currently there is extensive recycling of which of the following polymers?
A) high-density polyethylene
B) low-density polyethylene
C) both a and b
D) neither a nor b
A
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Passengers in a high-flying jumbo jet feel their normal weight in flight, while passengers in the orbiting space shuttle do not. This is because passengers in the space shuttle are
A) beyond the main pull of Earth's gravity. B) above Earth's atmosphere. C) without support forces. D) all of the above E) none of the above
During the last Ice Age, approximately 30% of Earth's land surface was covered by glaciers. Which of the following areas experienced the most glaciation?
A) Siberia B) Australia C) North America D) Europe
The term greenhouse effect describes the ____.
A. radiation of heat energy into space B. trapping of heat energy in the atmosphere C. effect climate change has on the economy D. efforts of the White House to support environmental legislation E. shrinking of the ozone layer
Tyrosine-tRNA synthetase belongs to which group of enzymes?
A) hydrolases B) ligases C) oxidoreductases D) transferases