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# Warm-blooded animals have elaborate physiological controls to maintain

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Re: Warm-blooded animals have elaborate physiological controls to maintain [#permalink]
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RahulHGGmat wrote:
Hi Expert,

Request you to explain the rationale of questions 1 and 4.

Explanation

1. The passage is primarily concerned with attempts to determine

Difficulty Level: 650

Explanation

This is a global question so keep the possible intentions of author in your mind. Lets have a look at each answer choice

A, B and E are easy to eliminate. C and D looks close. D is wrong because author is not looking for a constant body temperature

The text which is important to know the intentions of the author is:

Warm-blooded animals have elaborate physiological controls to maintain constant body temperature (in humans, 37℃). Why then during sickness should temperature rise,

........Thus, fever would make it more difficult for an infecting bacterium to acquire iron and thus to multiply.

4. If it were to be determined that “similar phenomena occur in warm-blooded animals”, which of the following, assuming each is possible, is likely to be the most effective treatment for warm-blooded animals with bacterial infections?

Difficulty Level: 700

Explanation

This is a CR type question so one can use his/her CR abilities here.

A and C are looking promising here, B is rather opposite. Read the lines in the passage.

When animals at 42℃ were injected with an iron solution, however, mortality rates increased significantly.

It has long been known that the level of serum iron in animals falls during infection...............He found that microbial synthesis of siderophores—substances that bind iron—in bacteria of the genus Salmonella declined at environmental temperatures above 37℃ and stopped at 40.3℃. Thus, fever would make it more difficult for an infecting bacterium to acquire iron and thus to multiply.

Option D and E are using faulty information from the passage.

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Re: Warm-blooded animals have elaborate physiological controls to maintain [#permalink]
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Re: Warm-blooded animals have elaborate physiological controls to maintain [#permalink]
Q2. According to the passage, Garibaldi determined which of the following?

(A) That serum iron is produced through microbial synthesis. Nowhere mentioned in the passage It is not produced but substances bind iron.
(B) That microbial synthesis of siderophores in warm-blooded animals is more efficient at higher temperatures. Opposite
He found that microbial synthesis of siderophores—substances that bind iron—in bacteria of the genus Salmonella "declined" at environmental temperatures above 37℃ and stopped at 40.3℃. Thus, fever would make it more difficult for an infecting bacterium to acquire iron and thus to multiply
Author explains that at high temp, synthesis of siderophores declined
(C) That only iron bound to other substances can be used by bacteria. Nowhere mentioned in the passage
(D) That there is a relationship between the synthesis of siderophores in bacteria of the genus Salmonella and environmental temperature.
"Garibaldi first suggested a relationship between fever and iron. He explains more about the relationship and mechanism between fever and synthesis of siderophores
(E) That bacteria of the genus Salmonella require iron as a nutrient. Nowhere mentioned in the passage
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Re: Warm-blooded animals have elaborate physiological controls to maintain [#permalink]
GMATNinja I have a doubt on the question number 4.
When the author says "similar phenomena occur in warm-blooded animals", the sentence immediately before that is "When animals at 42℃ were injected with an iron solution, however, mortality rates increased significantly".
So, shouldn't that be considered as the phenomena instead of the whole situation concerning the bacteria and everything?

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Re: Warm-blooded animals have elaborate physiological controls to maintain [#permalink]
RamseyGooner wrote:
GMATNinja I have a doubt on the question number 4.
When the author says "similar phenomena occur in warm-blooded animals", the sentence immediately before that is "When animals at 42℃ were injected with an iron solution, however, mortality rates increased significantly".
So, shouldn't that be considered as the phenomena instead of the whole situation concerning the bacteria and everything?

Hi RamseyGooner,

The sentence immediately before the highlighted lines: "even though healthy animals prefer the lower temperature. When animals at 42℃ were injected with an iron solution, however, mortality rates increased significantly. ", is not a phenomenon, instead its a part of the experiments conducted to explain : "It has long been known that the level of serum iron in animals falls during infection. "

Hope This Helps.
Thanks.
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Re: Warm-blooded animals have elaborate physiological controls to maintain [#permalink]
For question 3, why cannot the answer be E? Request explanation please.
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Re: Warm-blooded animals have elaborate physiological controls to maintain [#permalink]
Pankaj0901 wrote:
For question 3, why cannot the answer be E? Request explanation please.

Explanation

3. Which of the following can be inferred about warm-blooded animals solely on the basis of information in the passage?

Difficulty Level: 650-700

Explanation

(A) The body temperatures of warm-blooded animals cannot be easily controlled in the laboratory.
True: because the passage mentions "Cold-blooded animals were used to test this hypothesis because their body temperature can be controlled in the laboratory". From this, it can be inferred that warm-blooded animals' temperatures are harder to control in a lab.

(B) Warm-blooded animals require more iron in periods of stress than they do at other times.
B- No info to infer any of this.

(C) Warm-blooded animals are more comfortable at an environmental temperature of 37℃ than they are at a temperature of 42℃.
C- This is true for iguana's, who are cold-blooded.

(D) In warm-blooded animals, bacteria are responsible for the production of siderophores, which, in turn, make iron available to the animal.
Just an amalgam of incorrect info.

(E) In warm-blooded animals, infections that lead to fever are usually traceable to bacteria.
No such pattern is mentioned.

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Re: Warm-blooded animals have elaborate physiological controls to maintain [#permalink]

Posted from my mobile device
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Re: Warm-blooded animals have elaborate physiological controls to maintain [#permalink]
Ghostrider3147 wrote:

Posted from my mobile device

https://gmatclub.com/forum/warm-blooded ... l#p2772336
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Re: Warm-blooded animals have elaborate physiological controls to maintain [#permalink]
The problem with question 4 is that we fail to realize that "infecting bacterium" and in "bacteria" are basically the same thing
The confusion arises when u read this sentence
'It has long been known that the level of serum iron in animals falls during infection.'
now u would automatically expect the next sentence to tell why this happens but instead the upcoming sentence tells us that infecting bacteria r not able to multiply because they not get serum iron
wait what?! then why would the level of serum iron in animals fall during infection - this question is never answered even though if infecting bacteria r not able to acquire iron then the level of iron in animals should increase but it doesnt for some reason
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Re: Warm-blooded animals have elaborate physiological controls to maintain [#permalink]
Can anyone explain Q1 please ?­ Fever is just mentioned once in Garibaldi's experiment, how is it the primary purpose of the passage
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Warm-blooded animals have elaborate physiological controls to maintain [#permalink]
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