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In an attempt to genetically engineer a coffee plant that would produce beans containing no caffeine, Scientists prevented the production of an enzyme necessary for the synthesis of caffeine. Beans harvested from plants in which production of the enzyme was shut down throughout the plant contained no caffeine. However, there were normal amounts of caffeine in beans harvested from plants in which production of the enzyme was shut down in beans but not in the rest of the plant.If the information presented above is accurate, which of the following hypothesis is most strongly supported on the basis of it?(A) Measurable amounts of caffeine are present in the leaves of a coffee plants in which production of the enzyme has been completely stopped.(B) Caffeine production in coffee plants does not require the action of more than one enzyme.(C) Coffee made from the beans of the plants in which enzyme production was shut down only in the beans contains both caffeine and small quantities of the enzyme.(D) In coffee plants, either caffeine or the enzyme necessary for the production of caffeine move into the beans from elsewhere in the plant.(E) When the production of the enzyme is shut down in the beans but not in the rest of the coffee plant, the quantities of the enzyme produced in the rest of the plant are smaller than usual.
This is an inference-based problem. That means we must find an answer choice that can mostly be inferred from the passage.
A. tells us the opposite information. According to the passage, if
enzyme is completely stopped, there won't be caffeine. Out.
B. presents information that cannot be inferred from the passage. Out.
C. same as B.
D. can be resonably inferred from the passage. From the passage, we know that there were normal amounts of caffeine in beans harvested from plants in which production of the enzyme was shut down in beans but not in the rest of the plant. But why? D gives us the answer. D assumes that beans are not the origin of enzyme production. Enzyme is actually from elsewhere rather than the beans. That explains why there are still normal amounts of caffeine. Indeed, the passage doesn't mention exactly the same thing as choice D, but D presents a possible explanation that is based on the premises of the passage, and we can resonably infer D from the them.
E. The passage does not tell us how the quntities of the enzyme can change in relation to where the enzyme is produced. We cannot infer E.