How many different nucleotide bases are used in nucleic acids in life on Earth (consider both DNA and RNA)?
A) 25
B) 4
C) 20
D) 5
D
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The velocity and acceleration of an object
1.must have the same sign. 2.can have opposite signs. 3.must both be zero simultaneously; one cannot be zero and the other nonzero. 4.must have opposite signs.
A radio galaxy whose lobes are swept back as if forming a tail probably indicates
A) evidence for intergalactic matter. B) there must be another galaxy nearby. C) the galaxy is about to evolve into a spiral. D) the galaxy is moving towards Earth. E) the galaxy is isolated, not part of a cluster.
Four equal resistors connected across a DC voltage source in either series or parallel will have equal voltage drops across each resistor
Indicate whether the statement is true or false
How are the jets produced by radio galaxies similar to those produced by protostars?
What will be an ideal response?