What might have made the original solar nebula begin to contract?
A) the Big Bang
B) the formation of our arm of the Milky Way
C) the shock wave from a nearby exploding star
D) interstellar magnetism generated by pulsars
E) the large amount of angular momentum in the nebula
C
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If the layering of the close-packed planes in a FCC metal is ABCABCACABC, this is a _____________.
Fill in the blank(s) with the appropriate word(s).
Which of the following factors in the simplified Drake equation is least well known?
A) Nhp, the number of habitable planets in our galaxy B) fciv, fraction of life-bearing planets where intelligent civilizations have arisen at any time C) fnow, fraction of civilization-bearing planets that have intelligent civilizations on them now D) flife, fraction of life-bearing habitable planets
The Jewish calendar is kept roughly synchronized with a solar calendar by
A) having a thirteenth month with 5 days each year. B) adding a thirteenth lunar month to 7 out of every 19 years. C) having the first lunar month begin on the spring equinox. D) skipping a month every 7 out of 19 years. E) having the first lunar month begin on the summer solstice.
A section of DNA that does not correspond to a known protein is referred to as
A) redundant B) recombinant C) unencoding D) noncoding