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module6
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1992-01-01
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A
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1
1. A boy examining his finger under a microscope could detect no epidermal
cells because:
(A) these cells are located under the skin
(B) a finger consists of living tissue
(C) the nail blocked his view
(D) each single cell is larger than the area of the microscope field
(E) a finger is about one-half inch thick
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e
0
2
Correct.
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wrong answer explanation
2
(E) To be examined microscopically, a material must be thin enough to enable
light rays to pass through.
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2
2. Neutral pH is a value of:
(A) 1
(B) 4
(C) 7
(D) 10
(E) 14
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c
0
3
Correct.
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wrong answer explanation
3
(C) pH measures the concentration of hydronium ions. The pH scale ranges
from 0 to 14. Seven is neutral, neither acidic nor basic.
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3
3. In lactic fermentation of one glucose molecule, how many ATP are produced?
(A) 0
(B) 2
(C) 16
(D) 36
(E) 38
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b
0
4
Correct.
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wrong answer explanation
4
(B) Fermentation, which is anaerobic, is inefficient in getting ATP from
glucose, producing only 2 ATP, while complete oxidation of glucose would
produce 36 ATP.
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4
4. "Baby monkeys brought up in a bare cage without their mother or even
a toy substitute were found to develop an abnormal factor in their blood
plasma like that found in the blood of schizophrenic human patients."
In light of this finding, which of the following statements is tenable?
(A) Environmental conditions may influence the formation of certain
factors in the blood.
(B) In the light of present knowledge of cause and effect, such findings
cannot be accepted as true.
(C) The abnormal blood factor is the cause of schizophrenia.
(D) The facts cited are probably the result of dietary deficiencies.
(E) Schizophrenia is unrelated to imprinting.
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a
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5
Correct.
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wrong answer explanation
5
(A) An unusual and unnatural environmental condition can cause the
appearance of an abnormal factor.
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5
5. A pupil performed the following experiment: He tested a dry piece of
white bread with iodine solution; the bread turned blue-black. Then
he chewed another piece of white bread and tested it with Benedict's
(Fehling's) solution; the chewed bread turned red. He therefore
concluded that when a piece of bread is chewed, starch is changed to
sugar. One error in the pupil's procedure was that he did NOT:
(A) test the chewed piece of bread for starch
(B) test the dry piece of bread for protein
(C) consider the age of the bread
(D) use nitric acid
(E) test the dry piece of bread for sugar
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e
0
6
Correct.
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wrong answer explanation
6
(E) It must be established, before the experiment is actually performed,
that the piece of dry bread is not contaminated with sugar, since this
would alter the final results.
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6
6. You are interested in observing a small vacuole in a plant cell under
high power. After briefly viewing it under low power, you swing the
high-power objective into alignment. You can see a portion of the
cell in the field, but the vacuole is not visible. A probable cause
of the difficulty is that:
(A) you failed to raise the barrel of the microscope before swinging
into high power
(B) you did not center the vacuole in the field
(C) you did not reverse the mirror
(D) you did not use a higher power eyepiece
(E) immersion oil should have been put over the specimen before using
high power
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b
0
B
Correct.
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wrong answer explanation
B
(B) An object to be viewed under high power should be focused under low
power, in the center of the microscopic field, BEFORE switching to high
magnification.
end