Why do we think that RNA was probably the first self-replicating molecule?
A) it is able to replicate at high temperatures found near deep-sea ocean vents
B) it is much simpler than DNA
C) in laboratory studies researchers have shown that it is able to catalyze its own replication
D) it is able to replicate using carbohydrates rather than proteins
C
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The transmission of power from one place to another is evident in
A) household electricity. B) radio broadcast. C) mobile phones. D) all of the above
In any particular place on Earth, certain constellations are visible in the evening only at certain times of the year because ________
A) our evening view of space depends on where Earth is located in its orbit around the Sun B) some constellations are circumpolar C) on any particular night, we can only see stars that are directly opposite (180 degrees away from) the Sun in the sky D) during some times of year, some constellations drop below the southern horizon
A body is oscillating up and down at the end of a spring. Let's consider when the body is at the top of its up-and-down motion.The displacement vector from the equilibrium position
a. is zero. b. has its largest magnitude. c. points up. d. points down.
An object moves at a constant velocity of 12 m/s to the southwest for an interval of 20 s. Halfway through this interval, what is the magnitude of its instantaneous velocity?
a. It can be any value from 0 to 24 m/s. b. 6 m/s c. 12 m/s d. More information is needed.