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Updated on: 26 Jun 2021, 13:12
Originally posted by coffeeloverfreak on 06 Sep 2005, 21:14.
Last edited by Bunuel on 26 Jun 2021, 13:12, edited 5 times in total.
Last edited by Bunuel on 26 Jun 2021, 13:12, edited 5 times in total.
Edited the question.
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E
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
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56% (01:46) correct
44%
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wrong
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Source : GMATPrep Default Exam Pack
Recently documented examples of neurogenesis, the production of new brain cells, include the brain growing in mice when placed in a stimulating environment or neurons increasing in canaries that learn new songs.
(A) the brain growing in mice when placed in a stimulating environment or neurons increasing in canaries that
(B) mice whose brains grow when they are placed in a stimulating environment or canaries whose neurons increase when they
(C) mice's brains that grow when they are placed in a stimulating environment or canaries' neurons that increase when they
(D) the brain growth in mice when placed in a stimulating environment or the increase in canaries' neurons when they
(E) brain growth in mice that are placed in a stimulating environment or an increase in neurons in canaries that
Recently documented examples of neurogenesis, the production of new brain cells, include the brain growing in mice when placed in a stimulating environment or neurons increasing in canaries that learn new songs.
(A) the brain growing in mice when placed in a stimulating environment or neurons increasing in canaries that
(B) mice whose brains grow when they are placed in a stimulating environment or canaries whose neurons increase when they
(C) mice's brains that grow when they are placed in a stimulating environment or canaries' neurons that increase when they
(D) the brain growth in mice when placed in a stimulating environment or the increase in canaries' neurons when they
(E) brain growth in mice that are placed in a stimulating environment or an increase in neurons in canaries that
https://www.nytimes.com/2000/01/04/science/a-decade-of-discovery-yields-a-shock-about-the-brain.html
The new cells seen in the rat brains appear at a higher rate after challenges like intense training, injury or an infection, Dr. Raastad said. Within a few years, researchers found the cells in adult mice, guinea pigs, rabbits and monkeys. In the mid-1980's, other researchers found irrefutable evidence that new cells were born in the brains of adult canaries learning new songs and chickadees that were remembering where they had stashed their winter seeds. But researchers still did not believe that new cells were created in human brains, Dr. Raastad said.
In 1997, Dr. Elizabeth Gould, an assistant professor of neuroscience at Princeton, and colleagues showed that neurogenesis, or the birth of new cells, occurred in the hippocampuses of tree shrews and marmoset monkeys. But Dr. Rakic and others said this was not possible in humans.
In 1998, Dr. Gage demonstrated that the number of brain cells in the hippocampuses of mice raised in stimulating environments increased by 15 percent -- and that the cells were born in the ventricle zone.
The new cells seen in the rat brains appear at a higher rate after challenges like intense training, injury or an infection, Dr. Raastad said. Within a few years, researchers found the cells in adult mice, guinea pigs, rabbits and monkeys. In the mid-1980's, other researchers found irrefutable evidence that new cells were born in the brains of adult canaries learning new songs and chickadees that were remembering where they had stashed their winter seeds. But researchers still did not believe that new cells were created in human brains, Dr. Raastad said.
In 1997, Dr. Elizabeth Gould, an assistant professor of neuroscience at Princeton, and colleagues showed that neurogenesis, or the birth of new cells, occurred in the hippocampuses of tree shrews and marmoset monkeys. But Dr. Rakic and others said this was not possible in humans.
In 1998, Dr. Gage demonstrated that the number of brain cells in the hippocampuses of mice raised in stimulating environments increased by 15 percent -- and that the cells were born in the ventricle zone.
21 Jul 2012, 14:00
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The first thing to notice here is that we are looking for examples of neurogenesis. Because neurogenesis is an activity, a kind of growth, neither mice nor their brains can be an example of neurogenesis. We can eliminate A - C for this reason. We can eliminate D because it has a modifier error. "When placed" is an adverbial modifier, and should therefore modify an action or clause. For instance, we might say "When placed in a stimulating environment, mice grow new brain cells," or "Mice grow new brain cells when placed in a stimulating environment." All we have to modify here is a noun phrase--"the brain growth"--so we should not use an adverbial modifier. Note that we have the same modifier in A, but it is wrong for a slightly different reason. There, we have "the brain growing," which can be interpreted as an action, but now when we apply "when placed in a stimulating environment," it looks like we are saying that [i]the brain,[i] rather than the mouse, is being placed in that environment.
Note that in E, we have a noun modifier--"that are placed in a stimulating environment." This correctly modifies "mice." In turn, the phrase "in mice" correctly modifies "brain growth" to provide an example of neurogenesis. The parallel portion about canaries works in exactly the same way.
Note that in E, we have a noun modifier--"that are placed in a stimulating environment." This correctly modifies "mice." In turn, the phrase "in mice" correctly modifies "brain growth" to provide an example of neurogenesis. The parallel portion about canaries works in exactly the same way.
07 Sep 2005, 14:05
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Almost everyone is going with 4. From my poin of view that is wrong. Here is how....
the brain growth in mice when placed (what is placed mice or brain growth) a stimulating environment or the increase in canaries' neurons when they (what does THEY refer to here. They is a pronoun that should refer to a noun, in this case the noun is canaries' neurons. Remember canaries' is in possessive form here).
5 resolves it all.
mice is a plural of mouse(singular).
brain growth in mice that are placed in a stimulating environment
or an increase in neurons in canaries that learn new songs.
I may be wrong because my brain is disfunctional these days....
the brain growth in mice when placed (what is placed mice or brain growth) a stimulating environment or the increase in canaries' neurons when they (what does THEY refer to here. They is a pronoun that should refer to a noun, in this case the noun is canaries' neurons. Remember canaries' is in possessive form here).
5 resolves it all.
mice is a plural of mouse(singular).
brain growth in mice that are placed in a stimulating environment
or an increase in neurons in canaries that learn new songs.
I may be wrong because my brain is disfunctional these days....
My answer was B when I first saw this SC.
