Admission Tests GRE : GRE General Test

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Admission Tests GRE Exam Syllabus Topics:

Admission Tests GRE General Test Sample Questions:

1. Scientists have long debated the exact timing of the lunar cataclysm, a period approximately 4 billion years ago when Earth and the Moon were pummeled with asteroids. A clue to this puzzle may come from spherules, millimeter-sized droplets of molten rock formed after au asteroid collides explosively with a planet. Upon impact, the asteroid vaporizes both itself and the target rock, producing a vapor plume that condenses into spherules. These form a layer preserved in rock, whose age can be estimated using radiometric dating.
Scientists know of fourteen of these spherule layers scattered across Earth, but none dates to the theorized lunar cataclysm time period. Four layers, however, are from between 3.47 and 3.24 billion years ago.
indicating perhaps a slow decline in collisions.
The primary purpose of the passage is to

A) explain how a class of data might be useful for answering a question
B) describe different processes that could have produced the same phenomenon
C) outline a theory that may reconcile conflicting interpretations of a phenomenon
D) challenge a basic assumption underlying a theory
E) analyze a flaw in a novel approach to a problem

2. The author mentions "sentimental novels" primarily to

A) account for the increased attention being paid to certain kinds of writing
B) note the literary diversity of a particular historical period
C) question an assumption shared by certain scholars
D) emphasize the apparent incongruity of a scholarly omission
E) explain the relative obscurity of some categories of literature

3. The current_________of repackaged music under Miles Davis* name might prompt any reasonable person to conclude that the recording vault has been plundered bare.

A) hodgepodge
B) glut
C) modicum
D) surfeit
E) dearth
F) revival

4. All applicants for a certain job will take a skills test. An applicant who scores 80 percent or greater on the test has a probability of 0.65 of being hired.

A) Quantity A is greater.
B) The two quantities are equal.
C) The relationship cannot be determined from the information given.
D) Quantity B is greater.

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

Solutions: