The complete set of genetic information that makes up an organism is known as a
A) genome
B) codon
C) chromosome
D) gene
A
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In the equation: Number of Civilizations = Np × flife × fcivilization × fnow what do we mean by fnow?
A) the fraction of planets with civilizations on which the civilizations exist now B) the fraction of time since the Big Bang represented by the present era C) the fraction of all species ever to exist that we currently are aware of D) the fraction of planets in the galaxy on which a civilization could theoretically develop now E) the fraction of civilizations in the universe that currently are sending messages to us
The length of the Appalachian Trail is 2,015 miles. How long is it in kilometers?
A) 3,245 km B) 1,251 km C) 3,112 km D) 1,008 km E) 963 km
Collisions between galaxies are thought to
A) be commonplace. B) have stopped about 5 billion years ago. C) be extremely rare. D) have never occurred. E) have only occurred between 10 and 15 billion years ago.
If stars rotate with periods of tens of days, why does a neutron star rotate several to thousands of times a second?
A. When a neutron star collapses, its rotation rate speeds up because of conservation of angular momentum. B. The collapsing neutron star becomes hot and the fast rotation is the result of thermal energy. C. When a neutron star collapses, its rotation is kicked up by the ejected material from the supernova. D. When a neutron star collapses, the intensified magnetic field causes it to rotate much more quickly.