How many different amino acids make up proteins found in virtually all life on Earth?
A) 23
B) 5
C) 20
D) 4
C
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Wind blowing over the top of a hill
A) increases atmospheric pressure there. B) decreases atmospheric pressure there. C) does not affect atmospheric pressure there.
In 1983 the standard meter was redefined to what it is currently. What was the previous definition from 1960 based on?
a. specific alloy bar housed at Sevres, France b. wavelength of light emitted by certain krypton atoms c. distance from the Earth's equator to the North Pole d. the distance light travels in a certain fraction of a second
On a weather map we see an H for Highs and an L for Lows. In a high pressure region we generally can find
A) stormy weather. B) clear skies. C) very cold temperatures. D) cloud cover.
What is the prediction for the future of Triton?
A) It will provide the raw material for a future Neptunian ring. B) It will develop active volcanoes as Neptune's tidal stresses become greater. C) It will crash into Nereid when the smaller moon comes too close. D) Its orbit, while retrograde, is very stable and will not change. E) Its retrograde orbit will throw it back out into the Kuiper Belt again, with Pluto.