Four of the five statements about enzymes are correct. Select the exception
a. Enzymes control the speed of a reaction.
b. Enzymes change shapes to facilitate certain reactions.
c. Enzymes may place physical stress on the bonds of the substrate.
d. Enzymes may require cofactors.
e. Enzymes are not limited by environmental factors.
e
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Except for hydrogen, helium, and a little lithium, the lower-mass elements (lighter than iron) that are spread throughout the dust of the universe were created
A) during the shock of a supernova explosion. B) during the fusion process that powers the stars, and then released in supernova explosions. C) in hot white dwarf stars. D) in the original creation of the universe. E) in Kansas.
Why is the southern hemisphere of Mars believed to be older than the northern?
A) The southern hemisphere is darker much like the lunar mare. B) The southern hemisphere is more heavily cratered. C) The northern hemisphere is higher, due to the Tharsis Bulge. D) The northern hemisphere leans more away from the Sun in winter. E) The south polar cap is much thicker than the north one.
The force of gravity on a satellite in circular orbit doesn't change its speed because the force is
A) small compared to other forces on it. B) canceled by centrifugal force. C) perpendicular to its direction of motion. D) very weak due to altitude.
Why aren't small asteroids spherical in shape?
A) The strength of gravity of small asteroids is less than the strength of the rock. B) Small asteroids have odd shapes because they were all chipped off larger objects. C) Large asteroids became spherical because many small collisions chipped off pieces until only a sphere was left; this did not occur with small asteroids.