Enzymes are
A. catalysts.
B. proteins.
C. substrates.
D. both A and B
Answer: D
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Why are smaller nuclei such as carbon-14 often radioactive? (Carbon-12 is the most common and most stable form of carbon.)
A. The attractive force of the nucleons has a limited range. B. Hmmm... mysterious are the ways of the force. C. The isolated neutron is not stable and will undergo spontaneous transformation into a proton and an electron. D. both A and B E. none of the above
An exploration vehicle moves at 12 km/h both on Earth and on Mars. On Mars its momentum is
A. less. B. the same. C. greater. D. not enough information
Which feature of the thunderstorm is created by the gust front?
A) Letter A B) Letter F C) Letter C D) Letter D
Central America is typified as a rural peripheral economic area where the majority of the people __________.
a. is urban b. are Amerindians c. work in agriculture d. are expatriates e. live in mountainous regions