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# Lyme disease is caused by a bacterium transmitted - complete passage

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Manager
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Re: Lyme disease is caused by a bacterium transmitted - complete passage [#permalink]

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04 Aug 2016, 03:11
How is option A different from option B? Doesn't it convey the same meaning that the bacteria can affect in larvel and nymph stage and not in adult stage? Experts please explain.
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Re: Lyme disease is caused by a bacterium transmitted - complete passage [#permalink]

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04 Aug 2016, 04:06
How is option A different from option B? Doesn't it convey the same meaning that the bacteria can affect in larvel and nymph stage and not in adult stage? Experts please explain.

People can be infected even by an adult stage deer tick. Its not restricted to larva and nymph stage. But if a deer tick gets infected in the adult stage, it cannot transmit the disease since a deer tick can feed only one host in each stage.
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Re: Lyme disease is caused by a bacterium transmitted - complete passage [#permalink]

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04 Aug 2016, 08:33
Vyshak wrote:
How is option A different from option B? Doesn't it convey the same meaning that the bacteria can affect in larvel and nymph stage and not in adult stage? Experts please explain.

People can be infected even by an adult stage deer tick. Its not restricted to larva and nymph stage. But if a deer tick gets infected in the adult stage, it cannot transmit the disease since a deer tick can feed only one host in each stage.

still dont get it
feeding on an infected host in any of the tick's 3 stages
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Re: Lyme disease is caused by a bacterium transmitted - complete passage [#permalink]

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04 Aug 2016, 09:40
paidlukkha wrote:
Vyshak wrote:
How is option A different from option B? Doesn't it convey the same meaning that the bacteria can affect in larvel and nymph stage and not in adult stage? Experts please explain.

People can be infected even by an adult stage deer tick. Its not restricted to larva and nymph stage. But if a deer tick gets infected in the adult stage, it cannot transmit the disease since a deer tick can feed only one host in each stage.

still dont get it
feeding on an infected host in any of the tick's 3 stages

feeding on an infected host in any of the tick's 3 stages --> It means it can feed on an infected host to get itself infected in any of the three stages.
However, at a time, it can feed only on one host in each stage. --> It means, in every stage, it can either get infected by feeding on an infected host or it can transmit the disease by feeding on a non infected host.

Hope it helps.
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Re: Lyme disease is caused by a bacterium transmitted - complete passage [#permalink]

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10 Aug 2016, 03:47
Which of the following most logically completes the argument?

Lyme disease is caused by a bacterium transmitted to people by deer ticks. Deer ticks are almost never born infected with...[/spoiler][/quote]

each tick can only be transfer to one host in one stage, hence it can be transfered when it still in larva or nhymp, but it can not be transfered in adults, since it the last stage of the process in one host
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Re: Lyme disease is caused by a bacterium transmitted - complete passage [#permalink]

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05 Sep 2016, 07:21
can someone explain the argument in a simplified way please??

can humans be the host?? so the deer feeds on human??? it doesn't make sense at all

how can the disease be transmitted? is it by feeding?? if it's by feeding then ok B) makes sense
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Re: Lyme disease is caused by a bacterium transmitted - complete passage [#permalink]

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05 Sep 2016, 11:04
1
joealam wrote:
can someone explain the argument in a simplified way please??

can humans be the host?? so the deer feeds on human??? it doesn't make sense at all

how can the disease be transmitted? is it by feeding?? if it's by feeding then ok B) makes sense

OK .. trying to explain as simply as I can:

Deer ticks: an insect that has three phases (say I, II and III) in life. This insect is carrier of a bacteria (say X) that causes Lyme disease. The insect gets the bacteria X from someone else (say H1) while feeding on H1, who is already infected with the bacteria. Later the insect delivers the bacteria X to someone else (say H2) while feeding on H2.

The condition is that taking up and delivering of bacteria X cannot happen in the same phase of the insect's life because the insect feeds on only one animal or person in one phase of it's life (it cannot feed on both H1 and H2 in the same phase). If the insect gets the bacteria in phase I, it can deliver it in phase II or III. If the insect gets the bacteria in phase II, it can deliver it in phase III. If it gets in phase III, it cannot deliver at all.

Hosts: Hosts are the entities (could be humans or any animal) on whom the above insect feeds. H1 and H2 are both hosts (hosts of the insect).

Now read the explanations in the previous posts and hopefully you will understand the argument.
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Re: Lyme disease is caused by a bacterium transmitted - complete passage [#permalink]

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05 Sep 2016, 20:15
Michael KC Chen wrote:
Which of the following most logically completes the argument ?

Lyme disease is caused by a bacterium transmitted to people by deer ticks. Deer ticks are almost never born infected with the bacterium, but they can pick it up from feeding on an infected host in any of the tick's three successive stage of development: larva, nymph, adult. Once infected, a tick remains infected through any subsequent developmental stages, but since a tick feeds on only one host in each stage, it follows that ______________

A. People can be infected only by being bitten by a tick that is either in larval stage or in the nymph stage
B. People cannot be infected by a tick that picked up the Lyme disease bacterium in the adult stage
C. It is not possible for a person to be infected by a tick that is in the nymph stage or by a tick that was infected with the bacterium while in the nymph stage
D. People infected with the Lyme disease bacterium cannot transmit bacterium to adult deer ticks
E. Only deer ticks that are adults can transmit the Lyme disease bacterium to people

Does anyone know how to draw the logical picture of this question ?
I went with POE but still got this question incorrect ....
A/E are out for sure....
have no idea about the rest 3 ....

Thanks ...

A very tricky question for me , by reading the question could not make out that how is the disease transmitted . My understanding was the tick can get infected by feeding on an infected host . For transmitting it can do so in any other way like ingestion or a bite or something . It was only after reading the answers did I understand the passage
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Re: Lyme disease is caused by a bacterium transmitted - complete passage [#permalink]

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03 Oct 2016, 00:44
Very tricky question. Got thrown off by the first sentence and couldn't understand the second one in "Once infected, a tick remains infected through any subsequent developmental stages, but since a tick feeds on only one host in each stage". After reading the explanation, option choice B is a clear winner. I have selected D as it stands out from the other answer choices. Good question.
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Re: Lyme disease is caused by a bacterium transmitted - complete passage [#permalink]

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08 Oct 2016, 19:39
I was going to comment how I also still don't understand but I talked through it to myself (I originally chose A).

A is incorrect because a scenario can exist where a larva tick became infected, developed to the adult stage (as an already infected adult), proceeded to feed on the one host as an adult, and then infected that person. Also, as was pointed out, extreme language; "only" is also present in A.
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Re: Lyme disease is caused by a bacterium transmitted - complete passage [#permalink]

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09 Oct 2016, 12:19
eumbaapplicant799 wrote:
I was going to comment how I also still don't understand but I talked through it to myself (I originally chose A).

A is incorrect because a scenario can exist where a larva tick became infected, developed to the adult stage (as an already infected adult), proceeded to feed on the one host as an adult, and then infected that person. Also, as was pointed out, extreme language; "only" is also present in A.

lyme-disease-215972.html#p1731268
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Re: Lyme disease is caused by a bacterium transmitted - complete passage [#permalink]

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09 Nov 2016, 04:13
sayantanc2k wrote:
crescendo85 wrote:
Which of the following most logically completes the argument ?

Lyme disease is caused by a bacterium transmitted to people by deer ticks. Deer ticks are almost never born infected with the bacterium, but they can pick it up from feeding on an infected host in any of the tick's three successive stage of development: larva, nymph, adult. Once infected, a tick remains infected through any subsequent developmental stages, but since a tick feeds on only one host in each stage, it follows that ______________

A. People can be infected only by being bitten by a tick that is either in larval stage or in the nymph stage
B. People cannot be infected by a tick that picked up the Lyme disease bacterium in the adult stage
C. It is not possible for a person to be infected by a tick that is in the nymph stage or by a tick that was infected with the bacterium while in the nymph stage
D. People infected with the Lyme disease bacterium cannot transmit bacterium to adult deer ticks
E. Only deer ticks that are adults can transmit the Lyme disease bacterium to people

ans is B!..not clear at all

Sent you 1 SC also. Thnx in advance.

Deer ticks can feed on only one entity in each stage. The entity may be infected or may not be infected. If the entity is infected, deer tick gets infected. However it would not transmit the bacteria in the same stage, since it has already completed its quota of feeding (one feed per stage) for that stage - it won't feed on another entity in the same stage and if it cannot feed on another entity, it cannot transmit the bacteria as well. It can infect only in the next stage.

Thus if a deer tick gets infected in adult stage, it cannot infect a human, because it would die after the adult stage.

hi sayantanc2k,
i understand your point above. but from the stimulus, there is no information that only when deer ticks feed on people, they transmit the disease. it can transmit bacteria another ways. or we have to make that assumption.
tks alot
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Re: Lyme disease is caused by a bacterium transmitted - complete passage [#permalink]

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09 Nov 2016, 09:36
Mns1203 wrote:
sayantanc2k wrote:
crescendo85 wrote:
Which of the following most logically completes the argument ?

Lyme disease is caused by a bacterium transmitted to people by deer ticks. Deer ticks are almost never born infected with the bacterium, but they can pick it up from feeding on an infected host in any of the tick's three successive stage of development: larva, nymph, adult. Once infected, a tick remains infected through any subsequent developmental stages, but since a tick feeds on only one host in each stage, it follows that ______________

A. People can be infected only by being bitten by a tick that is either in larval stage or in the nymph stage
B. People cannot be infected by a tick that picked up the Lyme disease bacterium in the adult stage
C. It is not possible for a person to be infected by a tick that is in the nymph stage or by a tick that was infected with the bacterium while in the nymph stage
D. People infected with the Lyme disease bacterium cannot transmit bacterium to adult deer ticks
E. Only deer ticks that are adults can transmit the Lyme disease bacterium to people

ans is B!..not clear at all

Sent you 1 SC also. Thnx in advance.

Deer ticks can feed on only one entity in each stage. The entity may be infected or may not be infected. If the entity is infected, deer tick gets infected. However it would not transmit the bacteria in the same stage, since it has already completed its quota of feeding (one feed per stage) for that stage - it won't feed on another entity in the same stage and if it cannot feed on another entity, it cannot transmit the bacteria as well. It can infect only in the next stage.

Thus if a deer tick gets infected in adult stage, it cannot infect a human, because it would die after the adult stage.

hi sayantanc2k,
i understand your point above. but from the stimulus, there is no information that only when deer ticks feed on people, they transmit the disease. it can transmit bacteria another ways. or we have to make that assumption.
tks alot

Your point is valid. This is an underlying assumption when you select B - otherwise deer ticks may pick up the disease at early adult stage and then in later adult stage it could transmit in some other way (not by feeding).
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Re: Lyme disease is caused by a bacterium transmitted - complete passage [#permalink]

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09 Nov 2016, 09:53
Lyme disease is caused by a bacterium transmitted to people by deer ticks. Deer ticks are almost never born infected with the bacterium, but they can pick it up from feeding on an infected host in any of the tick's three successive stage of development: larva, nymph, adult. Once infected, a tick remains infected through any subsequent developmental stages, but since a tick feeds on only one host in each stage, it follows that ______________

A. People can be infected only by being bitten by a tick that is either in larval stage or in the nymph stage
B. People cannot be infected by a tick that picked up the Lyme disease bacterium in the adult stage
C. It is not possible for a person to be infected by a tick that is in the nymph stage or by a tick that was infected with the bacterium while in the nymph stage
D. People infected with the Lyme disease bacterium cannot transmit bacterium to adult deer ticks
E. Only deer ticks that are adults can transmit the Lyme disease bacterium to people

The tick progresses through three stages feeding only once in each stage.
So if the tick has already reached the adult stage and feeds on an infected bacterium to pick up the disease, it will not be able infect any people because it has already fed once for this stage.

hence B

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Re: Lyme disease is caused by a bacterium transmitted - complete passage [#permalink]

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13 Nov 2016, 18:03
B is the correct choice because the tick in it's adult stage will already have gotten the virus from its host. Based on the prompt, it will not change its host as it is in the last and final stage of its life.
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Re: Lyme disease is caused by a bacterium transmitted - complete passage [#permalink]

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16 Nov 2016, 03:06
I got this question on GMATPrep 6 verbal section. While analyzing my mistakes, I drew something similar on my notepad to visualize this better. It helps me to understand why option B is correct and why option A is not similar to option B and hence incorrect.

Hope it helps other clarifying their doubts.
Attachments

File comment: While thinking about the question, I drew something similar on my notepad. Hope it helps others to clarify their doubts.

Critical Reasoning.PNG [ 23.25 KiB | Viewed 1436 times ]

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Re: Lyme disease is caused by a bacterium transmitted - complete passage [#permalink]

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25 Nov 2016, 09:32
The only times I ever heard about deer ticks in my life are in GMAT #foreignstudentstruggles
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Re: Lyme disease is caused by a bacterium transmitted - complete passage [#permalink]

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21 Oct 2017, 04:57
Which of the following most logically completes the argument ?

Lyme disease is caused by a bacterium transmitted to people by deer ticks. Deer ticks are almost never born infected with the bacterium, but they can pick it up from feeding on an infected host in any of the tick's three consecuctive stages of development: larva, nymph, adult. Once infected, a tick remains infected through any subsequent developmental stages, but since a tick feeds on only one host in each stage, it follows that__________________.

a. people can be infected only by being bitten by a tick that is either in the larval stage or in the nymph stage
b. people cannot be infected by a tick that picked up the Lyme disease bacterium in the adult stage.
c. it is not possible for a person to be infected by a tick that is in the nymph stage or by a tick that was infected with the bacterium while in the nymph stage
d. people infected with the Lyme disease bacterium cannot transmit the bacterium to adult deer ticks
e. only deer ticks that are adults can transmit the Lyme disease bacterium to people
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Re: Lyme disease is caused by a bacterium transmitted - complete passage [#permalink]

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17 Nov 2017, 22:10
chetan2u wrote:
Michael KC Chen wrote:
Which of the following most logically completes the argument ?

Lyme disease is caused by a bacterium transmitted to people by deer ticks. Deer ticks are almost never born infected with the bacterium, but they can pick it up from feeding on an infected host in any of the tick's three successive stage of development: larva, nymph, adult. Once infected, a tick remains infected through any subsequent developmental stages, but since a tick feeds on only one host in each stage, it follows that ______________

A. People can be infected only by being bitten by a tick that is either in larval stage or in the nymph stage
B. People cannot be infected by a tick that picked up the Lyme disease bacterium in the adult stage
C. It is not possible for a person to be infected by a tick that is in the nymph stage or by a tick that was infected with the bacterium while in the nymph stage
D. People infected with the Lyme disease bacterium cannot transmit bacterium to adult deer ticks
E. Only deer ticks that are adults can transmit the Lyme disease bacterium to people

Does anyone know how to draw the logical picture of this question ?
I went with POE but still got this question incorrect ....
A/E are out for sure....
have no idea about the rest 3 ....

Thanks ...

Hi,
what I can make out of this CR--
Lyme disease is transmitted to people by deer tick carrying the bacteria causing the disease. the deer tick gets infected in any of the three stages by feeding on infected host. Thereafter it carries this bacteria. However deertick feeds on ONLY one host in each stage..

what does this mean--

1) deertick getting infected in larval stage, can transmit the disease to two people, one in its NYMPH stage and one in its ADULT stage..
2) deertick getting infected in nymph stage, can transmit the disease toone person in its ADULT stage..
3) Any deertick getting infected in adult stage, cannot transmit the disease to any one as it can feed only on ONE host in each stage, and OFCOURSE it got the bacterium while feeding on that ONE host and NOW it will not feed on any other person and thus will not spread the disease to any one ..

POINT 3 is covered by choice B..
Hope it helps

I thought "one host" meant one type of host... Dang
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Re: Lyme disease is caused by a bacterium transmitted - complete passage [#permalink]

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14 Apr 2018, 04:08
very nice question. you have to read this part very carefully - " Once infected, a tick remains infected through any subsequent developmental stages, but since a tick feeds on only one host in each stage".

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Re: Lyme disease is caused by a bacterium transmitted - complete passage   [#permalink] 14 Apr 2018, 04:08

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