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# Scientists who studied the famous gold field known as Serra

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Scientists who studied the famous gold field known as Serra  [#permalink]

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09 Apr 2009, 05:06
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Scientists who studied the famous gold field known as Serra Pelada concluded that the rich lode was not produced by the accepted methods of ore formation but that swarms of microbes over millions of years concentrated the gold from jungle soils and rivers and rocks.

A. not produced by the accepted methods of ore formation but that swarms of microbes over millions of years
B. not produced by the accepted methods of ore formation but instead swarms of microbes over millions of years that
C. not produced by the accepted methods of ore formation but swarms of microbes over millions of years that
D. produced not by the accepted methods of ore formation but by swarms of microbes that over millions of years
E. produced not by the accepted methods of ore formation but that swarms of microbes over millions of years

Source : GmatPrep test 1. Q#22.
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Re: Scientists who studied the famous gold field known as Serra  [#permalink]

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09 Apr 2009, 09:38
I will go with D.
Produced Not by X but by Y. X and Y being parallel.
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Re: Scientists who studied the famous gold field known as Serra  [#permalink]

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09 Apr 2009, 10:20
jeevanchand wrote:
I will go with D.
Produced Not by X but by Y. X and Y being parallel.

Why not A ?
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Re: Scientists who studied the famous gold field known as Serra  [#permalink]

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09 Apr 2009, 22:46
1
Agree with D. OA?

Why not A:
not produced by X but that Y.. not parallel and doesnt make sense

Why D:
produced not by X but by Y that...( here 'that' modifies Y )

GGUY wrote:
jeevanchand wrote:
I will go with D.
Produced Not by X but by Y. X and Y being parallel.

Why not A ?
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Re: Scientists who studied the famous gold field known as Serra  [#permalink]

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12 Apr 2009, 05:53
GGUY wrote:
Scientists who studied the famous gold field known as Serra Pelada concluded that the rich lode was not produced by the accepted methods of ore formation but that swarms of microbes over millions of years concentrated the gold from jungle soils and rivers and rocks.

A. not produced by the accepted methods of ore formation but that swarms of microbes over millions of years
B. not produced by the accepted methods of ore formation but instead swarms of microbes over millions of years that
C. not produced by the accepted methods of ore formation but swarms of microbes over millions of years that
D. produced not by the accepted methods of ore formation but by swarms of microbes that over millions of years
E. produced not by the accepted methods of ore formation but that swarms of microbes over millions of years

Source : GmatPrep test 1. Q#22.

IMO D).

not x (by the accepted methods of ore formation) but (by swarms of microbes) that "over million of years"
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16 Dec 2010, 16:58
not by x but by y is crucial here.
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Re: Scientists who studied the famous gold field known as Serra  [#permalink]

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04 Mar 2012, 10:45
I agree
produced not by x BUT by y...

(D)

GGUY wrote:
Scientists who studied the famous gold field known as Serra Pelada concluded that the rich lode was not produced by the accepted methods of ore formation but that swarms of microbes over millions of years concentrated the gold from jungle soils and rivers and rocks.

A. not produced by the accepted methods of ore formation but that swarms of microbes over millions of years
B. not produced by the accepted methods of ore formation but instead swarms of microbes over millions of years that
C. not produced by the accepted methods of ore formation but swarms of microbes over millions of years that
D. produced not by the accepted methods of ore formation but by swarms of microbes that over millions of years
E. produced not by the accepted methods of ore formation but that swarms of microbes over millions of years

Source : GmatPrep test 1. Q#22.
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Re: Scientists who studied the famous gold field known as Serra  [#permalink]

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04 Mar 2012, 23:11
A nice parallelism question.

Only D has the second "by" to be parallel to the action which indicates the cause of rich lode.
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31 Jul 2012, 20:58
In reply to why not A.... in this example concluded that and but that swarms of are not the two similar activities to check their parallelism..here the scientist concluded that rich lode was not produced a)by the accepted methods b)but by microbes over millions of years ....
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Re: Scientists who studied the famous gold field known as Serra  [#permalink]

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17 Oct 2014, 14:29
Is "but instead" in B considered redundant?
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Re: Scientists who studied the famous gold field known as Serra  [#permalink]

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26 Sep 2015, 01:19
A similar question came in my actual GMAT, I know "Not X but rather Y" is correct idiom. Is "Not X but instead Y" also a correct idiom?

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Re: Scientists who studied the famous gold field known as Serra  [#permalink]

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19 Aug 2017, 07:27
Parallelism

In A, “…not by X but that Y…” doesn’t maintain parallelism.
In B, “…not by X but instead Y…” is not parallel. Moreover, “instead” is redundant here.
In C, “…not by X but Y…” is not parallel. “by” is needed after “but”.
In D, “…not by X but by Y…” is parallel. Moreover, X and Y are parallel too. Hence, D is the best choice.
In E, “…not by X but Y…” is not parallel.
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Re: Scientists who studied the famous gold field known as Serra  [#permalink]

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26 Nov 2017, 02:36
GGUY wrote:
Scientists who studied the famous gold field known as Serra Pelada concluded that the rich lode was not produced by the accepted methods of ore formation but that swarms of microbes over millions of years concentrated the gold from jungle soils and rivers and rocks.

A. not produced by the accepted methods of ore formation but that swarms of microbes over millions of years
B. not produced by the accepted methods of ore formation but instead swarms of microbes over millions of years that
C. not produced by the accepted methods of ore formation but swarms of microbes over millions of years that
D. produced not by the accepted methods of ore formation but by swarms of microbes that over millions of years
E. produced not by the accepted methods of ore formation but that swarms of microbes over millions of years

Source : GmatPrep test 1. Q#22.

Answer D -- only D maintains parallelism
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Re: Scientists who studied the famous gold field known as Serra  [#permalink]

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04 Sep 2018, 09:26
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Not by X but by Y -- this is the point of correct idiom This template is available only in D; Therefore there is no need to look beyond.
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Re: Scientists who studied the famous gold field known as Serra  [#permalink]

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13 Dec 2018, 09:13
May I ask whether the "by" after "but" can be omitted? Why? In what conditions can I omit it and in what conditions I can't?
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13 Dec 2018, 10:04
Top Contributor
enochjason

Quote:
May I ask whether the "by" after "but" can be omitted? Why? In what conditions can I omit it and in what conditions I can't?

E has already that structure of omitting the preposition 'by' and is therefore wrong.
If you are using by after 'not', then you have to use 'by' compulsorily to keep //ism of correlative conjunction "not… but". You cannot, therefore, skip it. If there is no 'by' after 'not', then you can skip it after 'but'.
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Re: Scientists who studied the famous gold field known as Serra  [#permalink]

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16 Dec 2018, 08:44
Quote:
Scientists who studied the famous gold field known as Serra Pelada concluded that the rich lode was not produced by the accepted methods of ore formation but that swarms of microbes over millions of years concentrated the gold from jungle soils and rivers and rocks.

A. not produced by the accepted methods of ore formation but that swarms of microbes over millions of years
B. not produced by the accepted methods of ore formation but instead swarms of microbes over millions of years that
C. not produced by the accepted methods of ore formation but swarms of microbes over millions of years that
D. produced not by the accepted methods of ore formation but by swarms of microbes that over millions of years
E. produced not by the accepted methods of ore formation but that swarms of microbes over millions of years

Hi my honorable expert,
I'm not sure how 2 'and' has been used among 3 nouns (i.e., jungle soils, rivers, and rocks) without using any punctuation?
Thanks__
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Re: Scientists who studied the famous gold field known as Serra  [#permalink]

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11 Jan 2019, 15:40
1
Quote:
Scientists who studied the famous gold field known as Serra Pelada concluded that the rich lode was not produced by the accepted methods of ore formation but that swarms of microbes over millions of years concentrated the gold from jungle soils and rivers and rocks.

A. not produced by the accepted methods of ore formation but that swarms of microbes over millions of years
B. not produced by the accepted methods of ore formation but instead swarms of microbes over millions of years that
C. not produced by the accepted methods of ore formation but swarms of microbes over millions of years that
D. produced not by the accepted methods of ore formation but by swarms of microbes that over millions of years
E. produced not by the accepted methods of ore formation but that swarms of microbes over millions of years

Hi my honorable expert,
I'm not sure how 2 'and' has been used among 3 nouns (i.e., jungle soils, rivers, and rocks) without using any punctuation?
Thanks__

Public Service Announcement: do not waste your time looking for mistakes in the non-underlined portion of the sentence! Unless, of course, they somehow cause a problem in the underlined portion.

I certainly understand why the construction looks strange to you - it's fairly unconventional usage to write A and B and C, rather than A, B, and C, but it isn't wrong. Remember that if we write "X and Y" we don't use a comma, so there's no reason why we absolutely have to use commas when we write X and Y and Z." The commas in a list are there to signal to the reader that one element has ended and the next has begun, but "and" performs the same function. Here, if they'd written "jungle soils, rivers, and rocks," it might seem as though the writer intended to convey, "jungle soils, [jungle] rivers, and [jungle] rocks," as opposed to "rivers" and "rocks" in general. The "ands" avoid that ambiguity.

But ultimately, if we don't have the option of changing a construction, there's no reason to worry about it.

I hope that helps!
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Re: Scientists who studied the famous gold field known as Serra  [#permalink]

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11 Jan 2019, 16:03
GMATNinja wrote:
Quote:
Scientists who studied the famous gold field known as Serra Pelada concluded that the rich lode was not produced by the accepted methods of ore formation but that swarms of microbes over millions of years concentrated the gold from jungle soils and rivers and rocks.

A. not produced by the accepted methods of ore formation but that swarms of microbes over millions of years
B. not produced by the accepted methods of ore formation but instead swarms of microbes over millions of years that
C. not produced by the accepted methods of ore formation but swarms of microbes over millions of years that
D. produced not by the accepted methods of ore formation but by swarms of microbes that over millions of years
E. produced not by the accepted methods of ore formation but that swarms of microbes over millions of years

Hi my honorable expert,
I'm not sure how 2 'and' has been used among 3 nouns (i.e., jungle soils, rivers, and rocks) without using any punctuation?
Thanks__

Public Service Announcement: do not waste your time looking for mistakes in the non-underlined portion of the sentence! Unless, of course, they somehow cause a problem in the underlined portion.

I certainly understand why the construction looks strange to you - it's fairly unconventional usage to write A and B and C, rather than A, B, and C, but it isn't wrong. Remember that if we write "X and Y" we don't use a comma, so there's no reason why we absolutely have to use commas when we write X and Y and Z." The commas in a list are there to signal to the reader that one element has ended and the next has begun, but "and" performs the same function. Here, if they'd written "jungle soils, rivers, and rocks," it might seem as though the writer intended to convey, "jungle soils, [jungle] rivers, and [jungle] rocks," as opposed to "rivers" and "rocks" in general. The "ands" avoid that ambiguity.

But ultimately, if we don't have the option of changing a construction, there's no reason to worry about it.

I hope that helps!

But, there is a chance to modify the highlighted part to others if we misuse the use of "and" in the final items in the list!
Here is an example of my reasoning:

In today's night, you will meet Puja, my wife, and the mother of my children.
In this example, there are 3 persons.
Here is no chance for 'my wife' and 'the mother of my children' to modify 'Puja' simultaneously.

But, if I say something like below,
In today's night, you will meet Puja, my wife and the mother of my children.
In this example, this is just one person (Puja).
In this example, "my wife and the mother of my children" modifies 'Puja" simultaneously.
So, what's your opinion about my reasoning in the use of "and"?
Thanks__
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Re: Scientists who studied the famous gold field known as Serra  [#permalink]

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15 Jan 2019, 03:24
GGUY wrote:
jeevanchand wrote:
I will go with D.
Produced Not by X but by Y. X and Y being parallel.

Why not A ?

yes, why not A
it takes me a long time to consider meaning of choice A.

"rich lode was produced by the method" is not relevant to "microbes concentrate gold" and because there is no relevance, there can not be a contrast. there is no contrast, "but" is used wrongly.

meaning in choice D is clear contrast.

be ready to face meaning problem when 2 answer choices remain. this means we have to find out the meaning errors. meaning is unclear, not logic or redundant.

it can be hard to find meaning error in a short time in the test room and we can choose the choice which is most clear.
Re: Scientists who studied the famous gold field known as Serra   [#permalink] 15 Jan 2019, 03:24
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