Hi everyone,
Got 6/7 correct in 16:40 minutes, including 5:50 minutes to read.
--------------------------------------------------------------------------------------------P1In paragraph one we are given that the American lobster can have 2 kind of claws, their description, a comparison with relation to humans and the fact that such lobsters can have either of the two claws on the right or left side of their body.
Purpose: To present the claws of the American lobster.
P2Here we are given that the asymmetry starts at the 6th stage of development of the American lobster. Plus the author tells us that VE found out that if a claw is removed before the 6th stage and after the 3rd stage, that claw will always become a cutter like claw and the other a crusher claw.
Purpose: The purpose of this paragraph is to describe the development of asymmetry and highlight an interesting discovery.
P3Here the author points out that when a claw is removed we certainly know the outcome, but when a claw is not removed we don't. An explanation is given: maybe the claw that is used more frequently becomes a crusher.
Purpose: The purpose of this paragraph is to present a possible explanation for the seemingly rather rate of differentiation among the American lobsters
P4Here we are presented with an experimented intended to test the validity of the explanation presented in P3. Apparently if lobsters use their claws, they develop randomly a crusher claw but if they don't use their claws, the majority develops 2 cutter claws.
Purpose: The purpose of this paragraph is to test the validity of the explanation previously presented.
Main pointThe main point is to understand why American lobsters develop a crusher or a cutter claw in a seemingly random way.
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1. The passage is primarily concerned with
Pre-thinking
Main point question
The main point is to understand why American lobsters develop a crusher or a cutter claw in a seemingly random way.
(A) drawing an analogy between asymmetry in lobsters and handedness in humans
partial scope
(B) developing a method for predicting whether crusher claws in lobsters will appear on the left or right side
out of scope
(C) explaining differences between lobsters’ crusher claws and cutter claws
partial scope
(D) discussing a possible explanation for the way bilateral asymmetry is determined in lobsters
In line with pre-thinking
(E) summarizing the stages of development of the lobster
partial scope
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2. Each of the following statements about the development of a lobster’s crusher claw is supported by information in the passage EXCEPT:
Pre-thinking
Detail question
Let's evaluate each option
(A) It can be stopped on one side and begun on the other after the juvenile sixth stage.
The passage clearly states that after the 6th stage this scenario cannot occur
(B) It occurs gradually over a number of stages.
Supported
(C) It is initially apparent in the juvenile sixth stage.
supported
(D) It can occur even when a prospective crusher claw is removed in the juvenile sixth stage.
Yes, supported
(E) It is less likely in the absence of a manipulatable environment.
supported in the last paragraph
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3. Which of the following experimental results, if observed, would most clearly contradict the findings of Victor Emmel?
Pre-thinking
Weaken question
VE discovered an interesting finding about the claws. When one claw is cut during the 4th/5th stage of development, that claw becomes a cutter and the there a crusher.
(A) A left cutterlike claw is removed in the fifth stage and a crusher claw develops on the right side.
Strengthener
(B) A left cutterlike claw is removed in the fourth stage and a crusher claw develops on the left side.
Weakener
(C) A left cutterlike claw is removed in the sixth stage and a crusher claw develops on the right side.
Could happen
(D) Both cutterlike claws are removed in the fifth stage and a crusher claw develops on the left side.
could happen
(E) Both cutterlike claws are removed in the fourth stage and a crusher claw develops on the right side.
Could happen
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4. It can be inferred that of the two laboratory environments mentioned in the passage, the one with oyster chips was designed to
Pre-thinking
Inference/Function question
From the last paragraph: "Not coincidentally, at this stage of development lobsters typically change from a habitat where they drift passively, to the ocean floor where they have the opportunity to be more active by burrowing in the substrate."
(A) prove that the presence of oyster chips was not necessary for the development of a crusher claw
Not in line with pre-thinking
(B) prove that the relative length of time that the lobsters were exposed to the oyster-chip environment had little impact on the development of a crusher claw
Not in line with pre-thinking
(C) eliminate the environment as a possible influence in the development of a crusher claw
Not in line with pre-thinking
(D) control on which side the crusher claw develops
Not in line with pre-thinking
(E) simulate the conditions that lobsters encounter in their natural environmen
in line with pre-thinking
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5. It can be inferred from the passage that one difference between lobsters in the earlier stages of development and those in the juvenile fourth and fifth stages is that lobsters in the early stages are
Pre-thinking
Inference question
From the last paragraph: "Not coincidentally, at this stage of development lobsters typically change from a habitat where they drift passively, to the ocean floor where they have the opportunity to be more active by burrowing in the substrate."
(A) likely to be less active
[b]in line with pre-thinking[/b]
(B) likely to be less symmetrical
Not in line with pre-thinking
(C) more likely to lose a claw
Not in line with pre-thinking
(D) more likely to replace a crusher claw with a cutter claw
Not in line with pre-thinking
(E) more likely to regenerate a lost claw
Not in line with pre-thinking
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6. Which of the following conditions does the passage suggest is a possible cause for the failure of a lobster to develop a crusher claw?
Pre-thinking
Inference question
There are different possibilities: the lobster does not use his claw a lot; the lobster loses the cutter claw after the 6th stage....
(A) The loss of a claw during the third or earlier stage of development
we don't know that
(B) The loss of a claw during the fourth or fifth stage of development
Cannot be inferred
(C) The loss of a claw during the sixth stage of development
cannot be inferred
(D) Development in an environment devoid of material that can be manipulated
in line with what the experiment done in the last paragraph proves
(E) Development in an environment that changes frequently throughout the stages of development
cannot be inferred
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7. The author regards the idea that differentiation is triggered randomly when paired claws remain intact as
Pre-thinking
Detail question
The author seems to believe such theory
(A) irrefutable considering the authoritative nature of Emmel’s observations
Not in line with pre-thinking
(B) likely in view of present evidence
in line with pre-thinking
(C) contradictory to conventional thinking on lobster-claw differentiation
Not in line with pre-thinking
(D) purely speculative because it is based on scattered research and experimentation
Not in line with pre-thinking
(E) unlikely because of apparent inconsistencies with theories on handedness in humans
Not in line with pre-thinking
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