What was one reason that RNA was eventually replaced by DNA as the molecule of choice for storing genetic information?
A) the bases that make up DNA became much more common
B) DNA is far more stable than RNA
C) DNA can catalyze its own replication
D) the double helix of DNA is better able to correct errors in replication
D
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A particle leaves the origin with a velocity of 7.2 m/s in the positive y direction and moves in the xy plane with a constant acceleration of 
m/s2. At the instant the particle moves back across the x axis (y = 0), what is the value of its x coordinate?
A. 65 m B. 91 m C. 54 m D. 78 m E. 86 m
Two children ride on a merry-go-round, George is at a greater distance from the axis of rotation than Jacques. It is a true statement that
A) Jacques has a greater angular velocity than George. B) Jacques and George have the same angular velocity. C) Jacques has a smaller angular velocity than George. D) both have zero angular velocities. E) Cannot tell which one has the greater angular velocity without knowing their masses.
Reflecting telescopes are no longer popular with astronomers because they are expensive and suffer from chromatic aberration
a. True b. False Indicate whether the statement is true or false
If an elephant grows proportionally to twice its height, the area of its ears would be about
A) twice. B) four times more. C) six times more. D) eight times more. E) none of the above