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module5
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1992-01-01
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171 lines
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1
1. Although penicillin is used against the STAPHYLOCOCCUS AUREUS germ,
infections caused by it have become a serious problem in hospitals
because:
(A) a hospital environment is favorable to its growth
(B) the germ is brought in by visitors
(C) a strain of STAPHYLOCOCCUS more resistant to penicillin has
evolved
(D) many patients are allergic to penicillin
(E) a hospital provides a sterile environment for the germ to grow
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c
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2
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wrong answer explanation
2
(C) A mutation has made them resistant.
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2
2. A new species was discovered living in salt water. It possessed five
pairs of jointed legs, a hard exoskeleton, and filter-feeding apparatus.
The species was likely:
(A) an insect
(B) a mammal
(C) a crustacean
(D) a mollusk
(E) an echinoderm
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c
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3
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(C) The characteristics described are those of a crustacean.
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3
3. A new drug for treatment of tuberculosis was being tested in a hospital.
Patients in Group A actually received doses of the new drug; those in
Group B were given only sugar pills. Group B represents:
(A) a scientific experiment
(B) a scientific method
(C) an experimental error
(D) an experimental control
(E) none of these
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d
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4
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(D) That part of an experiment kept under normal conditions is called the
control group.
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4
4. The ability to taste a certain chemical is a dominant trait among
humans. If both parents are nontasters, the percent of childern
likely to be tasters is:
(A) 0
(B) 25
(C) 50
(D) 100
(E) 75
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a
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5
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(A) Only recessive genes are responsible for the nontasting trait in humans.
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5
5. A colorblind father will transmit the gene for colorblindness to:
(A) 50 percent of his sons
(B) 50 percent of his grandsons
(C) 100 percent of his sons
(D) 100 percent of his daughters
(E) 75 percent of his sons
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d
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6
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(D) Males must transmit their X chromosome, containing the gene for color
blindness, to all their daughters.
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6
6. The materials that would be most useful in demonstrating that
germinating seeds give off carbon dioxide are a glass bottle,
glass tubing,
(A) limewater, a rubber stopper, lima beans
(B) colchicine, test tubes, wheat
(C) a rubber stopper, a beaker, lima beans
(D) a battery jar, limewater, sawdust
(E) gibberellic acid, sawdust, a beaker
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a
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7
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(A) The germinating lima bean seeds emit carbon dioxide.
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7
7. If two coins were flipped simultaneously a great number of times,
the expected results would be:
(A) two heads, 50 percent; two tails, 50 percent
(B) two heads, 25 percent; one head, one tail, 50 percent; two tails,
25 percent
(C) two heads, 25 percent; two tails, 75 percent
(D) two heads, 50 percent; one head, one tail 50 percent
(E) none of these combinations
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b
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8
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8
(B) A 1:2:1 ratio is evident.
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8
8. A chemical called PTC tastes bitter to about 75 percent of the people.
The other 25 percent do not detect any taste in PTC. The ability to
taste PTC has been traced to a single pair of alleles that follow the
Mendelian law of dominance. What inference can most reasonably be
drawn from this description of the action of PTC?
(A) The nontasters of PTC are probably pure recessives.
(B) The nontasters of PTC probably do not taste other chemicals well
either.
(C) The tasters of PTC are probably all pure homozygous types.
(D) The tasters of PTC probably have inherited an ability to learn the
taste of PTC.
(E) The taste buds of nontasters are probably defective.
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a
0
B
Correct.
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wrong answer explanation
B
(A) The results show a 3:1 ratio that illustrates the phenotypic ratio of
Mendel's law of segregation.
END