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cbrd44
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module5
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1992-01-01
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187 lines
NEW SET
A
Type the letter of the best answer.
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1
1. An increase in the number of rabbits in an area can affect the number
of plants, insects, mice, and birds. The biological principle best
represented by this illustration is:
(A) the balance of nature
(B) symbiosis
(C) evolution
(D) cooperation
(E) saprophytism
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a
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2
Correct.
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wrong answer explanation
2
(A) Every organism within a given ecological niche is dependent upon
another organism.
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2
2. A dog breeder can determine that a "hairless" dog is a mutation if
the dog:
(A) is still "hairless" after 5 years
(B) shows no change in the "hairless" condition after its diet is
changed
(C) develops other conspicuous differences from the parent
(D) is bred and the trait is capable of being inherited
(E) is crossed with the pure dominant over a period of generations
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d
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3
Correct.
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wrong answer explanation
3
(D) Mutations breed true.
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3
3. In order to decrease an abnormally high rate of metabolism, the
surgeon may remove part of the:
(A) adrenal gland
(B) pancreas
(C) pituitary gland
(D) thyroid gland
(E) parathyroid gland
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d
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4
Correct.
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wrong answer explanation
4
(D) Thyroxin speeds up the oxidation rate of the body.
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4
4. A swimmer discovered that by inhaling and exhaling deeply and rapidly
for 1 minute before diving, he could stay underwater much longer than
usual. The reason is that the extra breathing:
(A) removed impurities from his lungs
(B) reduced the concentration of carbon dioxide in his blood
(C) tired his diaphragm and slowed its normal rhythm
(D) temporarily increased the size of his lungs
(E) none of the above
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b
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5
Correct.
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wrong answer explanation
5
(B) The carbon dioxide level decreases.
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5
5. The presence of coal deposits in Alaska shows that at one time Alaska:
(A) was covered with ice
(B) was connected to Asia
(C) was formed by volcanic action
(D) had cavemen
(E) had a tropical climate
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e
0
B
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wrong answer explanation
B
(E) Coal deposits are formed by conditions of high temperature and pressure
acting directly on jungle plants.
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NEW SET
B
Type the letter of the best answer.
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1
6. Some land animals have gill slits in early stages of their development.
This would seem to indicate that:
(A) most land animals have the ability to swim
(B) land animals appeared before water animals
(C) land animals have two-chambered hearts
(D) land animals descended from fishlike ancestors
(E) none of the above
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d
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2
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wrong answer explanation
2
(D) Higher vertebrates have no present use for these primitive organs.
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2
7. Blue indolphenol turns colorless in the presence of ascorbic acid.
A food would be an excellent source of Vitamin C if, when mixed with
indolphenol:
(A) no bleaching occurred
(B) the chemical was bleached almost immediately
(C) 10 minutes elapsed before any bleaching could be detected
(D) the food dissolved in the chemical
(E) the food was boiled first
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b
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3
Correct.
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3
(B) If the food turns the chemical colorless, ascorbic acid is present.
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3
8. Birds and bats are both flying, warm-blooded vertebrates, yet they are
NOT considered closely related because of the difference in their:
(A) brain structure
(B) embryological development
(C) ability to see
(D) ability to hear
(E) blood circulation
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b
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4
Correct.
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wrong answer explanation
4
(B) The young birds are nourished within the confines of an egg. Young bats
are mammals and are therefore nourished by the placenta within the uterus.
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4
9. If many tall pea plants were crossed, which result would be LEAST
probable? (Tallness is dominant to shortness in peas.)
(A) 100 percent pure tall
(B) 50 percent pure tall, 50 percent hybrid tall
(C) 50 percent tall, 50 percent short
(D) 75 percent tall, 25 percent short
(E) none of these
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c
0
C
Correct.
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wrong answer explanation
C
(C) The only genotypic possibilities for the parent generation are pure
dominant and hybrid.
end