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Nearly a century ago, biologists found that if they separate

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Re: Nearly a century ago, biologists found that if they separate [#permalink] New post 04 Nov 2014, 03:26
gmatfighter12 wrote:
I got number 1, 2 and 5 wrong in 12 mins.

And yes, I don't agree with number 1 and 2. How come the target audience is undergraduate student?


DNA wrap around them to form a structure that resem-
bles beads, or knots, on a string. The beads are DNA
segments wrapped around the histones; the string is the
intervening DNA. And it is the structure of these beaded
(50) DNA strings that guides the fate of the cells in which
they are located.

This is really basic info. The passage cannot address scientists and researchers with such basic stuff. Hence, undergrad students. This was my reasoning, you may choose to differ.
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Nearly a century ago, biologists found that if they separate [#permalink] New post 18 Feb 2015, 07:55
It took me 18' and these were my responses:
1. E
2. C WRONG (correct E) --> mistake understood
3. D
4. B WRONG (correct E)--> . I was between B and E, but couldn't decide between the two... Shoud have chosen E, because of the word "experiment" in B.
5. A
6. B
7. C
8. D
9. D

I will explain my line of reasoning in answering 2 of the questions. I chose 6 and 9, because people asked about them and they have not been explained. I think the rest of the questions people wanted an explanation for have been addressed.

Q. 6: These are the parts of the passage I combined to answer B.
" In the unfertilized egg, the substances are inactive and are not distributed homogeneously. When the egg is fertilized, the substances become active and, presumably, govern the behavior of the genes they interact with" plus in the folowing paragraph "The substances that Gross studied are maternal messenger RNA’s... He and other biologists studying a wide variety of organisms have found that these particular RNA’s direct, in large part, the synthesis of histones...".

Q. 9: (D) The predicament of a linguist trying to develop a theory of language acquisition when knowledge of the structure of language itself is rudimentary at best.
I got to D because it says in the passage that scentists were asking the wrong questions. So, they didn't have a frim basis to move on from.
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Re: Nearly a century ago, biologists found that if they separate [#permalink] New post 18 Mar 2015, 08:42
Made 2-3 mistakes. Doesn't look like a gmat type passage. Too dense.
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Nearly a century ago, biologists found that if they separate [#permalink] New post 19 Mar 2015, 02:24
Text wansn't that tough, the questions however were not easy. It was a nice read. One wrong overall, took me some time though. I went for E on the second one too :)
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Re: Nearly a century ago, biologists found that if they separate [#permalink] New post 09 Jul 2015, 09:11
DmitryFarber wrote:
2. It can be inferred from the passage that the morphogenetic determinants present in the early embryo are
(A) located in the nucleus of the embryo cells
(B) evenly distributed unless the embryo is not developing normally
(C) inactive until the embryo cells become irreversibly committed to their final function
(D) identical to those that were already present in the unfertilized egg
(E) present in larger quantities than is necessary for the development of a single individual

One tricky thing here is that we have several places to look for an answer. However, since the question is about embryos, not eggs, we are better off looking at the first paragraph. (E) is supported because in some cases we can get two individuals from one embryo. If that's true, there must be more than enough MD to make one.

(A) We don't know anything about the nucleus of embryo cells, but we're told that the MD lie outside the nucleus of egg cells.
(B) The egg part says that the MD are not evenly distributed.
(C) We never find out when the cells become irreversibly committed.
(D) We are never told if the MD are all the same. Maybe some MD are created, replaced, or destroyed, or maybe the dad provides some.


I agree with ur explanation regarding option E.
But if u see below sentences

Now investigators think they know at least some of the molecules that act as morphogenetic determinants in early development. They have been able to show that, in a sense, cell determination begins even before an egg is fertilized.

cant we say that since morphogenetic determinants exist in early development and cell determination begins even before an egg is fertilized, morphogenetic determinants present in the early embryo are identical to those that were already present in the unfertilized egg.

According this I feel option D is correct.
Please explain?
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Re: Nearly a century ago, biologists found that if they separate [#permalink] New post 13 Jul 2015, 09:36
On 6th question: we need to choose the best possible answer. My strategy was whichever step that, mentioned in the passage, happens later during the process of fertilization is more (or should) be dependent on fertilization. Hence the option B.

(A) Copying of maternal genes to produce maternal messenger RNA’s
(B) Synthesis of proteins called histones
(C) Division of a cell into its nucleus and the cytoplasm
(D) Determination of the egg cell’s potential for division
(E) Generation of all of a cell’s morphogenetic determinants
Re: Nearly a century ago, biologists found that if they separate   [#permalink] 13 Jul 2015, 09:36

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