Lakes that suffer from environmental acidification typically have
A) fewer animals and higher levels of aluminum and heavy metals.
B) more animals and lower levels of aluminum and heavy metals.
C) more plants, fewer animals, and slightly higher levels of aluminum and heavy metals.
D) fewer plants, more animals, and slightly lower levels of aluminum and heavy metals.
A
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A group of languages that share a common origin but have since evolved into individual languages is a
A) dialect. B) language branch. C) language family. D) language group. E) language root.
Which of the following statements about water resources is true?
A) The U.S. Environmental Protection Agency frequently creates policy for questions of water quantity and distribution. B) Most water policy decisions in the United States are made at national levels. C) Many countries have addressed their water resources and water needs with national policies and agencies. D) The World Water Forum has found that water supplies for developing nations will stabilize over the next decade.
Amino acids are molecules which contain both an amino group and a carboxyl group. Proteins are made up of a-amino acids which, except for proline, have the general formula NH2-CHR-COOH where the R group determines the identity of the amino acid. With the exception of proline, which of the following is true of the amino group in a-amino acids?
A) It is always 1°. B) It is always 2°. C) It is always 3°. D) It is 1°, 2° or 3° depending on the identity of R.
The joints in the photograph mimic topography, indicating that they formed
A) while the granite was still molten.
B) while the rocks were still buried at great depth.
C) when the weight of overlying rocks was unloaded, allowing expansion along the joints.
D) along a subduction zone.