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Admission Tests GRE Exam Syllabus Topics:

Admission Tests GRE General Test Sample Questions:

1. Business leaders who prefer centralized, pyramidal managerial structures to diversity and competition tend to (i)_________dissent in the decision-making process. But this insistence on (ii)_________can be dangerous in that it deprives decision makers of a full range of alternatives.

A) overrate
B) spontaneity
C) deprecate
D) foster
E) ambiguity
F) unanimity'

2. Recent research has questioned the long-standing view of pearly mussels as exclusively suspension feeders (animals that strain suspended particles from water) that subsist on phytoplankton (mostly algae). Early studies of mussel feeding were based on analyses of gut contents, a method that has three weaknesses. First, material in mucus-bound gut contents is difficult to identify and quantify. Second, material found in the gut may pass undigested out of the mussel, not contributing to its nutrition. Finally, examination of gut contents offers limited insight into the mechanisms and behaviors by which mussels acquire food. Modem studies suggest that pearly mussels feed on more than just algae and may use other means than suspension feeding. Pedal feeding (sweeping up edible material with a muscular structure called the foot) has been observed in juvenile pearly mussels.
Besides the phytoplankton pearly mussels capture from the water column, their guts also contain small animals, protozoans, and detritus (nonliving particulate organic material). Recent studies show that mussels can capture and assimilate bacteria as well, a potentially important source of food in many fresh waters.
Another potential source of food for mussels is dissolved organic matter. Early studies showing that pearly mussels could take up simple organic compounds were largely discounted because such labile (unstable) compounds are rarely abundant in nature. Nevertheless, recent work on other bivalves suggests that dissolved organic matter may be a significant source of nutrition.
Of this complex mix of materials that pearly mussels acquire, what is actually required and assimilated?
Stable-isotope analyses of mussels taken from nature and of captive-reared mussels are beginning to offer some insight into this question. Nichols and Garling showed that pearly mussels in a small river were omnivorous, subsisting mainly on particles less than 2S micrometers in diameter, including algae, detritus, and bacteria. Bacterially derived carbon was apparently the primary source of soft-tissue carbon. However, bacteria alone cannot support mussel growth, because they lack the necessary long-chain fatty acids and sterols and are deficient in some amino acids. Bacteria may supplement other food resources, provide growth factors, or be the primary food In habitats such as headwater streams, where phytoplankton is scarce. Juvenile mussels have been most successfully reared m the laboratory on diets containing algae high in polyunsaturated fatty acids. Thus, it appears that the pearly mussel diet in nature may consist of algae, bacteria, detritus, and small animals and that at least some algae and bacteria may be required as a source of essential biochemicals.
The primary purpose of the passage is to

A) explain why evidence used to support a long-standing view about pearly mussels is flawed
B) summarize the present state of knowledge about what pearly mussels eat
C) question whether research findings about laboratory-reared pearly mussels can be extrapolated to pearly mussels in natural habitats
D) suggest that a particular source of nutrients is more essential to pearly mussels than was previously thought
E) contrast two mechanisms by which pearly mussels have been shown lo feed

3. Like paleontologists who interpret timescales from fossil evidence, we infer the history of star formation in the Milky Way galaxy from the heavy-element composition of its stars. According to the big bang theory of the origin of the universe, the first gas clouds-and the first generation of stars formed from them-were composed of pure hydrogen and helium; most heavier elements- iron and calcium, for example-came later, created by explosions of supernovas, massive stars in their death throes. Loaded with heavy elements, material ejected from supernovas enriched the interstellar gas clouds from which the next generation of stars formed, the level of heavy elements increasing with succeeding generations. Because most stars live for many billions of years and because the Milky Way is thus composed of multiple stellar generations, comparing the number of stars of low heavy-element abundance with those of high heavy-element abundance enables astronomers to untangle the history of star formation in the Milky Way.
The passage contains information about each of the following subjects EXCEPT the

A) time in the history of the galaxy when calcium and iron first appeared
B) composition of early generations of stars
C) events that led to the presence of heavier elements in stars
D) age of the Milky Way galaxy relative to the age of other galaxies
E) composition of early interstellar gas clouds

4. Exhibit.

The variance of n numerical data x1, x2, x3, , , , , xn with the mean x is equal to were S is the sum of the equal



differences for
For the shares of stock purchased and then sold by the investors shown, the mean of the 5 numbers for Stock Y is 50 and the corresponding mean for Stock X is 70. The variance of the 5 numbers for Stock }' is what fraction of the corresponding variance for Stock X ?
A)

B)

C)

D)

E)

A) Option
B) Option
C) Option
D) Option
E) Option

5. In the age of new media technologies, the (i)_________an event and its recording appears to have been (ii)_________: rather than referring to a concert in which both performers and audience members are (iii)M
"live" is increasingly used to identify the way in which a performance was recorded or transmitted.

A) quality of
B) distinction between
C) culturally sophisticated
D) revenue from
E) erased
F) misunderstood
G) physically present
H) emotionally engaged
I) maximized

Solutions: