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# In experiments in which certain kinds of bacteria were

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Senior Manager
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In experiments in which certain kinds of bacteria were [#permalink]

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01 Feb 2007, 21:17
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In experiments in which certain kinds of bacteria were placed in a generous supply of nutrients, the populations of bacteria grew rapidly, and genetic mutations occurred at random in the populations. These experiments show that all genetic mutation is random.
Which one of the following, if true, enables the conclusion to be properly drawn?
(A) Either all genetic mutations are random or none are random.
(B) The bacteria tested in the experiments were of extremely common forms.
(C) If all genetic mutations in bacteria are random, then all genetic mutations in every other life form are random also.
(D) The kind of environment in which genetic mutation takes place has no effect on the way genetic mutation occurs.
(E) The nutrients used were the same as those that nourish the bacteria in nature.

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01 Feb 2007, 21:38
Give me D!
Negate this and the conclusion falls apart.

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Re: CR: Bacteria [#permalink]

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01 Feb 2007, 22:54
the premise shows that genetic mutation is random for bateria.then the conclusion is made that gentic mutation is random for all.this can only be concluded if assumption is made that if genetic mutaion is random for bacteria then it should be for all.

choice C

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01 Feb 2007, 23:42
D !
_________________

"Education is what remains when one has forgotten everything he learned in school."

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02 Feb 2007, 00:34
D...

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02 Feb 2007, 01:10
A

From an experiment on certain kinds of bacteria, its difficult to generalise. Random genetic mutation might be true only for the kind of bacteria used for experimentation or it may be that few genetic mutations, which are observed in experiment is random.
If we accept A, we can conclude that â€œall genetic mutation is randomâ€

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Director
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Re: CR: Bacteria [#permalink]

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02 Feb 2007, 02:22
AK47 wrote:
the premise shows that genetic mutation is random for bateria.then the conclusion is made that gentic mutation is random for all.this can only be concluded if assumption is made that if genetic mutaion is random for bacteria then it should be for all.

choice C

I think C is the answer. C bridges the information gap that exists in the argument. D is an assumption. No?

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02 Feb 2007, 07:48
im all about C, the conclusion states that all genetic mutation is random, how can we derive that from an experiment that shows that genetic mutation in bacteria is random? by answer choice C , stating that if it's random in bacteria it is random everywhere

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02 Feb 2007, 07:55
C TOO

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02 Feb 2007, 08:03
Quote:
(C) If all genetic mutations in bacteria are random, then all genetic mutations in every other life form are random also.

Can't be C. The experiment does not show that all genetic mutations in bacteria are random and therefore the conclusion that all genetic mutations are random can't be drawn.

Quote:
(A) Either all genetic mutations are random or none are random.

The genetic mutations in the experiment were random and therefore all genetic mutations have to be random, drawing the conclusion that all genetic mutations are random.

Therefore answer is A

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Re: CR: Bacteria [#permalink]

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02 Feb 2007, 10:20
gmacvik wrote:
In experiments in which certain kinds of bacteria were placed in a generous supply of nutrients, the populations of bacteria grew rapidly, and genetic mutations occurred at random in the populations. These experiments show that all genetic mutation is random.
Which one of the following, if true, enables the conclusion to be properly drawn?
(A) Either all genetic mutations are random or none are random.
(B) The bacteria tested in the experiments were of extremely common forms.
(C) If all genetic mutations in bacteria are random, then all genetic mutations in every other life form are random also.
(D) The kind of environment in which genetic mutation takes place has no effect on the way genetic mutation occurs.
(E) The nutrients used were the same as those that nourish the bacteria in nature.

I pick A.- If all are either Random or Not Random and we have an experiment that shows some are random...Then, ALL must be random.

A most closely supports the conclusion, although D is close.

B-what if the environment has greater impact than type of bacteria used?
C-Every other life form is Out of Scope
D-Could be factors other than environment that affect they way mutations occur in other instances
E-What if the bacteria is different in nature than that in the experiment?

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02 Feb 2007, 22:26
khaos wrote:
Quote:
(C) If all genetic mutations in bacteria are random, then all genetic mutations in every other life form are random also.

Can't be C. The experiment does not show that all genetic mutations in bacteria are random and therefore the conclusion that all genetic mutations are random can't be drawn.

Quote:
(A) Either all genetic mutations are random or none are random.

The genetic mutations in the experiment were random and therefore all genetic mutations have to be random, drawing the conclusion that all genetic mutations are random.

Therefore answer is A

Excellent Analysis. I change my answer to A.

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03 Feb 2007, 08:39
aurobindo wrote:
khaos wrote:
Quote:
(C) If all genetic mutations in bacteria are random, then all genetic mutations in every other life form are random also.

Can't be C. The experiment does not show that all genetic mutations in bacteria are random and therefore the conclusion that all genetic mutations are random can't be drawn.

Quote:
(A) Either all genetic mutations are random or none are random.

The genetic mutations in the experiment were random and therefore all genetic mutations have to be random, drawing the conclusion that all genetic mutations are random.

Therefore answer is A

Excellent Analysis. I change my answer to A.

choice A = Either all genetic mutations are random or none are random.

but if the genetic mutations are not random(which has 50 % chance),then the conclusion that all genetic mutations have to be random can't be drawn.

what's the oa???

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04 Feb 2007, 11:46
THose who chose A are correct.

OA is A

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Re: CR: Bacteria [#permalink]

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05 Feb 2007, 05:50
conclusion = These experiments show that all genetic mutation(in bacteria or in all life forms??) is random.

i found the conclusion a little bit ambiguous.

i could read it in the following way which i didn't.

conclusion = These experiments show that all genetic mutation(in bacteria) is random.

if i read the conclusion to be for bacteria then the assumption (choice A = Either all genetic mutations are random or none are random.) is the answer.

choice C can be eliminated because the experiment was conducted on certain kind of bacteria .
so basing experiment on "certain kind" of bacteria,one cant say---- If all genetic mutations in "bacteria" are random, then all genetic mutations in every other life form are random also ---- this goes out of scope.

in summary i would say,

the assumption is choice A if the conclusion read "These experiments show that all genetic mutation(in bacteria) is random."

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Re: CR: Bacteria   [#permalink] 05 Feb 2007, 05:50
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# In experiments in which certain kinds of bacteria were

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