Enzymes are

A. catalysts.
B. proteins.
C. substrates.
D. both A and B


Answer: D

Environmental & Atmospheric Sciences

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A) Letter A B) Letter F C) Letter C D) Letter 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

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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

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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

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