A distinctive characteristic of prokaryotes is ________
A) their oxygen based metabolism
B) their lack of a separation between the DNA and the rest of the cell
C) their thick cell walls that separate the DNA from the rest of the cell
D) their ability to produce sugars
E) their methane based metabolism
B
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What is the best way to attack the root cause of food insecurity in less-developed countries?
A. Family planning B. Immunizing more children C. Reducing food waste in the U.S. D. Donating more food to those countries
How often during a year is the sun directly overhead at Mexico City (latitude 19°N)?
A. twice B. never C. four times D. once
Using Map T-22b, the “SP Mountain, Arizona,” quadrangle (scale 1:24,000; contour interval 40 feet), calculate the gradient of SP Mountain (35°34'56"N, 111°37'55"W) from the north base of the cone (at the 6200' contour) toward the crater rim. On the edge of a piece of paper measure out a distance of 0.2 miles using the graphic map scale, and then determine the elevation change over that distance.
In this problem, you will compute the gradients of Mauna Loa in Hawai‘i, Mount Vsevidof in Alaska, and SP Mountain in Arizona. (You may also determine the elevation changes and distances needed to calculate these gradients by using Google Earth™.) The recommended starting point and distance to measure are given for all three volcanoes.
Epiphytic plants, such as various species of orchids (Orchidaceae), grow upon another plant, using the plants for physical support, but bringing no harm to the host plant. This is an example of which symbiotic relationship?
A) parasitism B) mutualism C) commensalism D) amensalism E) synnecrosis