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  #1  
Old 11-23-2012
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Default Help me label this image

Help me label this image-capture.png

Basically we have to find lab contaminant in this slide.

Its an NBME question image. If this is also against copyright issue then really sorry. As i don't have any other way to ask this.
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  #2  
Old 11-23-2012
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I remember doing this question ,they asked for the contaminant which I believe is "D" but the answer they gave is different.

D falls outside the streak lines...?
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  #3  
Old 11-23-2012
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i think it should be A .
BUT i dont see a point in explaining since i m not sure if i am correct.

please mention in heading , NBME spoiler ,if someone post question. thx
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  #4  
Old 11-24-2012
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Quote:
Originally Posted by Kabutar111 View Post
i think it should be A .
BUT i dont see a point in explaining since i m not sure if i am correct.

please mention in heading , NBME spoiler ,if someone post question. thx
Sorry forgot to mention. My friend took this NBME online and she also marked A.
It was an incorrect answer. So technically we left with other options.
More over I want to know how exactly we interpret this stuff. Like- what's all these labeling mean.


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Old 11-24-2012
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What sort of question is this
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  #6  
Old 11-24-2012
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I think its D
Cause when u prepare microbial culture on petri dish u move a tiny wire containing microorganisms back and forth on media so colonies form in areas of wire tracks
D is located outside the tracks
Hope i explained in an understandable way
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Old 11-24-2012
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koolkiller first post that what is the qtn regarding this figure so that everybody can understand the qtn?
can it b the pic of organisms like gram positive cocci rod and gram negative cocci and rods......
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Old 11-24-2012
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Quote:
Originally Posted by MedicalExaminer View Post
I think its D
Cause when u prepare microbial culture on petri dish u move a tiny wire containing microorganisms back and forth on media so colonies form in areas of wire tracks
D is located outside the tracks
Hope i explained in an understandable way
I used same logic , but colony of different type should grow on non inoculated region.and D could be drop fall during inoculation stage.
That's why I choose A
If A not answer than I will with D
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Old 11-24-2012
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Quote:
Originally Posted by amresh kumar View Post
koolkiller first post that what is the qtn regarding this figure so that everybody can understand the qtn?
can it b the pic of organisms like gram positive cocci rod and gram negative cocci and rods......
I don't think that would make difference . But why would you think it will.
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Old 11-24-2012
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Quote:
Originally Posted by billy View Post
What sort of question is this
Guess and move to next kinda question. Hehehe


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  #11  
Old 11-24-2012
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The contanminant is (D) the little dot.

Google up "petri dish streaking procedure" =)
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  #12  
Old 11-24-2012
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Quote:
Originally Posted by amresh kumar View Post
koolkiller first post that what is the qtn regarding this figure so that everybody can understand the qtn?
can it b the pic of organisms like gram positive cocci rod and gram negative cocci and rods......
First of all, it's an NBME question. So against copyright issues.
There was nothing much in question regarding type of bacteria or other.
And is there much difference in gram +ve and - ve bacteria culture?


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  #13  
Old 11-24-2012
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Quote:
Originally Posted by MedicalExaminer View Post
I think its D
Cause when u prepare microbial culture on petri dish u move a tiny wire containing microorganisms back and forth on media so colonies form in areas of wire tracks
D is located outside the tracks
Hope i explained in an understandable way
I thought the same and marked D. It's correct according to NBME offline key but I posted this question to get to know about other labelings.

May be we have to search an microbiology graduate to get clear picture but just wondering what exactly NBME want us to know from this question.


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  #14  
Old 11-24-2012
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Just read a post regarding not posting NBME ques. So I want to say, I realized i had to put NBME as topic name but forgot to mention before and later i was not able to change title and tried my best that this won't be a spoiler to anyone.

Anyways i got this image in internet but this image confused me more but still D is only possible answer here with other labeling as in this image.

Help me label this image-petri-dish1.jpg
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