What is the MOST important role that carbohydrates play in living organisms on Earth?
A) long-term energy storage and cell structure
B) information storage
C) basic functioning of living organisms
D) short-term energy storage
D
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In most extrasolar planetary systems the center of mass is likely to be located
A) midway between the star and its most massive planet B) close to the center of the parent star C) exactly at the center of the parent star D) close to the center of the most massive planet
Dr. X believes that the Hubble constant is H0 = 20 km/s/Mly while Dr. Y believes it is H0 = 24 km/s/Mly. Which statement below automatically follows?
A) Dr. X believes that the universe is expanding, but Dr. Y does not. B) Dr. X believes that the universe is older than Dr. Y believes. C) Dr. X believes that the universe has a much higher density than Dr. Y believes. D) Dr. X believes that the universe will someday stop expanding, while Dr. Y believes it will expand forever. E) Dr. X believes that the Andromeda Galaxy (a member of our Local Group) is moving away from us at a slower speed than Dr. Y believes.
Suppose a "psychic" tells you that "At midnight tonight, everything will double in size." This statement is
A) a scientific prediction that is probably false because the experimental evidence will probably disprove it [based on past experience]. B) a nonscientific statement because no experiment can check it to determine whether it is true or false. C) the greatest idea since sliced bread. D) a nonscientific statement because it is based completely on guess-work. E) a scientific prediction that is certainly false.
What energy must be added or given off in a reaction where two hydrogen atoms and two neutrons are combined to form a helium atom? (Atomic masses for each: hydrogen, 1.007 825 u; neutron, 1.008 665 u; helium, 4.002 602 u; also, 1 u = 931.5 MeV/c2)
a. 74.85 MeV added b. 74.85 MeV given off c. 28.30 MeV given off d. 28.30 MeV added