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Home Q & A Board Biology-Related Homework Help Cell Biology
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wang wang
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6 years ago
Numerous Xenopus cells were exposed to varying amounts of ultraviolet light. Some of the resulting cells were observed to lack nucleoli. As a result, one would expect that the cell could not
A:perform cellular respiration
B:replicate its DNA
C:perform photosynthesis
D:synthesis rRNA
E:non of the above
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bio_manbio_man
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#1
Educator
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6 years ago
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wang Author
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#2
6 years ago Edited: 6 years ago, wang
thank you  Slight Smile
Post Merge: 6 years ago

why not B?
Can it stil replicate its DNA?
wang Author
wrote...
#3
6 years ago
Quote from: bio_man (6 years ago)
why not B?Can it stil replicate its DNA?
why not B?
Can it stil replicate its DNA?
wrote...
#4
Educator
6 years ago
I suppose the nucleolus is mainly important for mRNA synthesis. The two are in fact exclusive, I see your point
wang Author
wrote...
#5
6 years ago
Quote from: wang (6 years ago)
Some of the resulting cells were observed to lack nucleoli.
why?
wrote...
#6
Educator
6 years ago
Quote from: wang (6 years ago)
Some of the resulting cells were observed to lack nucleoli.

I don't think there's a scientific reason for that. If there is, my hypothesis is that the UV light disrupted the delicate rRNA molecules, or the UV damaged the genes responsible for creating the rRNA molecules, of which make up the nucleoli.

Regardless, that's not the point of the question. They are giving us an artificial scenario
wang Author
wrote...
#7
6 years ago
thanks~
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