Even though ethane (C2H6 ) has a liquid temperature range almost as wide as water, it is not as good a biological solvent as water because it is a liquid at
A) much higher temperatures which would result in the breakdown of fragile biological molecules
B) very high pressures that are unlikely to be found elsewhere
C) very low pressures that are unlikely to be found elsewhere
D) much lower temperatures which would result in extremely slow metabolic reactions
D
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What is true about the stellar populations in the Galaxy?
A) Most open clusters are in the halo. B) The bluest stars are in the halo. C) Only old stars are found in the halo. D) The main star forming regions are outside the Galactic plane. E) Red stars are only found in the bulge.
You are standing on a bathroom scale in an elevator that is not moving and it reads 500 N. The elevator then moves downward at a constant velocity of 4.50 m/s. What does the scale read?
A. 100 N B. 450 N C. 500 N D. 750 N E. 250 N
Why use nuclear power on a satellite?
a. It can supply energy for many years on long space missions. b. Solar cells don't work well in the outer solar system far from the Sun. c. Sending radioactive materials into space is a good way to get rid of them so they don't create a hazard on Earth. d. all of the above
Doubling the wavelength of a photon would ______________
a. reduce its energy to one-half b. double its energy c. triple its energy d. not change