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Contents

PRACTICE TEST 47 3
PRACTICE TEST 48 8
PRACTICE TEST 49 13
PRACTICE TEST 50 19
PRACTICE TEST 51 24
PRACTICE TEST 52 28
PRACTICE TEST 53 33
PRACTICE TEST 54 36
PRACTICE TEST 55 41
PRACTICE TEST 56 46
PRACTICE TEST 57 51
PRACTICE TEST 58 56
PRACTICE TEST 59 61
PRACTICE TEST 60 66
PRACTICE TEST 61 72
PRACTICETEST 62 77
PRACTICE TEST 63 82
PRACTICE TEST 64 82
PRACTICE TEST 65 82
PRACTICE TEST 66 82
ANSWER KEY 82



PRACTICE TEST 47


January 1993

Passage 1

Bacteria are extremely small living things. While we measure our own sizes in inches or centimeters, bacterial size is measured in microns. One micron is a thousandth of a millimeter a pinhead isabout a millimeter across. Rod shaped bacteria are usually from two to tour microns long, while rounded ones are generally one micron in diameter Thus if you enlarged a founded bacterium a thousand times, it would be just about the size of a pinhead. An adult human magnified by the same amount would be over a mile(1.6 kilometers) tall.

Even with an ordinary microscope, you mustlook closely to see bacteria. Using a magnification of 100 times, one finds that bacteria are barely visible as tiny rods or dots One cannot make out anything of their structure. Using special stains, one can see that some bacteria have attached to them wavy - looking "hairs" called flagella. Others have only one flagellum. The flagella rotate, pushing the bacteria though the water. Many bacterialack flagella and cannot move about by their own power while others can glide along over surfaces by some little understood mechanism.

From the bacterial point of view, the world is a very different place from what it is to humans To a bacterium water is as thick as molasses is to us. Bacteria are so small that they are influenced by the movements of the chemical molecules aroundthem. Bacteria under the microscope, even those with no flagella, often bounce about in the water. This is because they collide with the water molecules and are pushed this way and that. Molecules move so rapidly that within a tenth of a second the molecules around a bacterium have all been replaced by new ones even bacteria without flagella are thus constantly exposed to a changing environment.1. Which of the following is the main topic of the passage?
(A) The characteristics of bacteria (B) How bacteria reproduce
(C) The various functions of bacteria (A) How bacteria contribute to disease

2. Bacteria are measured in
(A) inches (B) centimeters (C) microns (D) millimeters

3. Which of the following is the smallest?
(A) A pinhead (B) A rounded bacterium(C) A microscope (D) A rod-shaped bacterium

4. According to the passage, someone who examines bacteria using only a microscope that magnifies 100 times would see
(A) tiny dots (B) small "hairs"
(C) large rods (D) detailed structures

5. The relationship between a bacterium and its flagella is most nearly analogous to which of the following?
(A) A rider jumping on ahorse's back (B) A ball being hit by a bat
(C) A boat powered by a motor (D) A door closed by a gust of wind

6. In line 16, the author compares water to molasses, in order to introduce which of the following topics?
(A) The bacterial content of different liquids
(B) What happens when bacteria are added to molasses
(C) The molecular structures of different chemicals
(D) Howdifficult it is for bacteria to move through water





Passage 2

One of the most popular literary figures in American literature is a woman who spent almost half of her long life in China, a country on a continent thousands of miles from the United States. In her lifetime she earned this country's most highly acclaimed literary award: the Pulitzer Prize, and also the most...