What accounts for the higher coral species diversity in the Pacific and Indian Oceans compared to the Atlantic?
What will be an ideal response?
Tropical areas of the Atlantic tend to have cooler waters and more turbid conditions due to runoff from land. As a result, only those corals that are adapted to withstand such conditions will survive in these waters. In addition, the Indo-Pacific region is much older geologically and covers a larger area. This means that species have had more time to evolve in these waters and there are many more niches in which the species can evolve, resulting in a much greater species diversity in the Indo-Pacific regions
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The nitrogen-limitation hypothesis states that organisms select food in terms of the nitrogen content of the tissue. Why might this be true?
A. Animal tissue contains about 10 times as much nitrogen as plant tissue. B. Animals are able to "fix" nitrogen much more effectively than plants. C. Herbivores prefer plants with lower nitrogen content. D. High nitrogen levels are a key part of plant chemical defenses. E. Plant tissue contains about 10 times as much nitrogen as animal tissue.
Transposons may leave a cell by incorporating themselves into a plasmid
Indicate whether this statement is true or false.
The complement fixation test uses red blood cells as the target for complement activation. Test serum containing antibodies is combined with a known amount of antigen in a tube, and then the RBCs and antibodies against the RBCs are added. A positive result for the complement fixation test would be
A) a line of precipitate near the bottom of the tube. B) a cloudy solution in the tube. C) loss of color in the tube. D) a fluorescent precipitate. E) a solution that is clear due to precipitation of RBCs.
The white-eyed gene in Drosophila is recessive and sex-linked. Assume that a white-eyed female is mated to a wild-type male. What would be the phenotypes of the offspring?
A) all wild type B) females wild type, males white eyed C) all white eyed D) females white eyed; males wild type E) females half wild type, half white eyed; males white eyed