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26 Jul 2023, 07:30
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Question 1
C
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
15%
(low)
Question Stats:
76% (01:52) correct
24%
(01:42) wrong
based on 161
sessions
History
Date
Time
Result
Not Attempted Yet
Question 2
D
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
15%
(low)
Question Stats:
78% (01:08) correct 22%
(01:10) wrong
based on 151
sessions
History
Date
Time
Result
Not Attempted Yet
Question 3
C
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
45%
(medium)
Question Stats:
60% (01:23) correct 40%
(01:13) wrong
based on 156
sessions
History
Date
Time
Result
Not Attempted Yet
In 2010, the National Aeronautics and Space Administration (NASA) discovered a new species of bacteria, called the GFAJ-1 strain, that for a while promised to change our understanding of how living things survive. Deep in the waters of Mono Lake in California, NASA scientists discovered a form of bacteria that seemed to use arsenic, plentiful in its habitat, to make DNA and proteins. Most life forms are made from six main building blocks: carbon, hydrogen, nitrogen, oxygen, sulfur, and phosphorus. Arsenic is toxic to most known organisms, but the GFAJ-1 strain can tolerate high concentrations of arsenic, and initial studies suggested that it could even incorporate the chemical into its cells. Some scientists claimed that this discovery had opened new possibilities for life elsewhere in the universe, as the existence of such a microbe would show that organisms can exist in chemical environments that scientists may not have considered.
1. Which of the following statements best summarizes the passage?
A. The presence of arsenic-based bacteria would prove that there is life on other planets.
B. Scientists have discovered that arsenic is not toxic to most known organisms.
C. Claims made about the GFAJ-1 strain challenged scientists’ perception of how living organisms survive.
D. If GFAJ-1 were established as using arsenic to build its DNA, scientists would need to consider adding this element to the six main building blocks of life.
E. The ecosystem of Mono Lake is a scientific phenomenon that scientists will be studying for years.
A. The presence of arsenic-based bacteria would prove that there is life on other planets.
B. Scientists have discovered that arsenic is not toxic to most known organisms.
C. Claims made about the GFAJ-1 strain challenged scientists’ perception of how living organisms survive.
D. If GFAJ-1 were established as using arsenic to build its DNA, scientists would need to consider adding this element to the six main building blocks of life.
E. The ecosystem of Mono Lake is a scientific phenomenon that scientists will be studying for years.
2. According to the information in the passage, upon discovery of the GFAJ-1 strain, some scientists believed it was
A. a water-based bacteria that had a high tolerance for toxins
B. one of the six building blocks of life
C. a form of arsenic that was toxic to most living organisms
D. a strain of bacteria that incorporated arsenic into its cells
E. a form of DNA that did not need phosphorus to grow
A. a water-based bacteria that had a high tolerance for toxins
B. one of the six building blocks of life
C. a form of arsenic that was toxic to most living organisms
D. a strain of bacteria that incorporated arsenic into its cells
E. a form of DNA that did not need phosphorus to grow
3. Based on the information in the passage, what reasonable conclusions can be drawn?
I. If a species of bacteria can use arsenic in cell development, it is possible that planets that have high levels of arsenic might be able to support living organisms.
II. If the GFAJ-1 strain’s chemical processes do not follow the same patterns as those of other organisms, the strain must have originated on another planet.
III. If scientists have discovered a living organism that uses arsenic in place of one of the six building blocks of life, it is possible that there may be other chemicals in addition to arsenic that can support life.
A. I Only
B. III Only
C. I and III Only
D. II and III Only
E. I, II, and III
I. If a species of bacteria can use arsenic in cell development, it is possible that planets that have high levels of arsenic might be able to support living organisms.
II. If the GFAJ-1 strain’s chemical processes do not follow the same patterns as those of other organisms, the strain must have originated on another planet.
III. If scientists have discovered a living organism that uses arsenic in place of one of the six building blocks of life, it is possible that there may be other chemicals in addition to arsenic that can support life.
A. I Only
B. III Only
C. I and III Only
D. II and III Only
E. I, II, and III
Kaplan GRE Verbal Workbook 2018
31 Aug 2023, 11:27
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Please provide explanation for Q3.
Thanks
Thanks
31 Aug 2023, 13:42
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abhishektyga
Official Explanation
3. Based on the information in the passage, what reasonable conclusions can be drawn?
Explanation
This question asks you to evaluate the statement and identify the conclusions you can validly draw using the information from the passage.
Choice (I) is a reasonable conclusion because it is based on the claim cited in the passage that arsenic-based bacteria would have “opened new possibilities for life elsewhere in the universe.”
(II) is not based on any information stated in the passage. The passage suggests that the discovery of this new bacteria had implications for the likelihood of finding life on other planets, but it does not suggest that the bacteria came from another planet.
(III) is a reasonable conclusion because the passage states that initial studies of GFAJ-1 suggested that “organisms can exist in chemical environments that scientists may not have considered.”
Answer: C
Explanation
This question asks you to evaluate the statement and identify the conclusions you can validly draw using the information from the passage.
Choice (I) is a reasonable conclusion because it is based on the claim cited in the passage that arsenic-based bacteria would have “opened new possibilities for life elsewhere in the universe.”
(II) is not based on any information stated in the passage. The passage suggests that the discovery of this new bacteria had implications for the likelihood of finding life on other planets, but it does not suggest that the bacteria came from another planet.
(III) is a reasonable conclusion because the passage states that initial studies of GFAJ-1 suggested that “organisms can exist in chemical environments that scientists may not have considered.”
Answer: C
