winterschool
Q1. With decreased production this year in many rice-growing countries, prices of the grain on world markets have increased. Analysts blame this increase on the fact that only a small percentage of world production is sold commercially, with government growers controlling most of the rest, distributing it for local consumption. With so little rice being traded freely, even slight changes in production can significantly affect the amount of rice available on world markets. Which one of the following, if true, would most call into question the analysts’ explanation of the price increase? (A) Rice-importing countries reduce purchases of rice when the price increases dramatically. (B) In times of decreased rice production, governments store more of the rice they control and reduce their local distribution of rice. (C) In times of decreased rice production, governments export some of the rice originally intended for local distribution to countries with free grain markets. (D) Governments that distribute the rice crop for local consumption purchase the grain commercially in the event of production shortfalls. (E) During reduced rice harvests, rice-importing countries import other kinds of crops, although this fails to compensate for decreased rice imports. Difficulty - Hard
winterschool
Q2. In tests for pironoma, a serious disease, a false positive result indicates that people have pironoma when, in fact, they do not; a false negative result indicates that people do not have pironoma when, in fact, they do. To detect pironoma most accurately, physicians should use the laboratory test that has the lowest proportion of false positive results. Which of the following, if true, gives the most support to the recommendation above? (A) The accepted treatment for pironoma does not have damaging side effects. (B) The laboratory test that has the lowest proportion of false positive results causes the same minor side effects as do the other laboratory tests used to detect pironoma. (C) In treating pironoma patients, it is essential to begin treatment as early as possible, since even a week of delay can result in loss of life. (D) The proportion of inconclusive test results is equal for all laboratory tests used to detect pironoma. (E) All laboratory tests to detect pironoma have the same proportion of false negative results.
CR Questions September - 29 :Q1. In 1994, the most common eye-related disease from which Americans suffered was conjunctivitis, and glaucoma was a distant second. Glaucoma is much more common among patients who are more than 50 years old than it is among those who are 50 or younger, but the incidence rate for conjunctivitis is the same for people of all ages. The average age of all Americans is expected to exceed 50 by the year 2010.
Which of the following conclusions can be most properly drawn about eye-related diseases from the information given?
A. conjunctivitis will remain the most common eye-related disease among Americans in 2010.
B. By the year 2010, glaucoma will overtake conjunctivitis as the most common eye-related disease.
C. More people will suffer from conjunctivitis in 2010 than did in 1994.
D. Most Americans will encounter either conjunctivitis or glaucoma by 2010.
E. The average age of Americans suffering from conjunctivitis will increase between 1994 and 2010.
Difficulty - Hard
Q2. For over a century, drosophila melanogaster have been used to study genetics. Commonly known as fruit flies, drosophila lend themselves well to behavioral studies because they are small and easily handled, have short reproductive cycles, and are easily anesthetized with unsophisticated equipment. In the laboratory, fruit flies are confined in small glass containers to facilitate their anesthetization prior to examination for specific traits. It has been observed by several studies that the trait for short, less-powerful wings is dominate over that for large wings that enable longer flights. Thus, many geneticists theorize that shorter wings give drosophila an advantage in obtaining food sources in the wild.
The theory in the argument above is based on which of the following assumptions?
A. Fruit flies have no need to fly long distances in their search for food sources.
B. The social behaviors exhibited by drosophila indicate that shorter wings give individual flies an advantage in mating.
C. The common practice of confining drosophila to small containers does not affect the trait for wing size.
D. Fruit flies that are anesthetized on a regular basis mate just as frequently as those that are not.
E. The shorter reproductive cycles of drosophila are not influenced by the number of flies in a single container.
Difficulty - Hard