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makvit [3.9K]
4 years ago
10

What element do all organic compounds contain? Nitrogen Oxygen Carbon Hydrogen

Biology
2 answers:
svlad2 [7]4 years ago
7 0
The answer would be Carbon
levacccp [35]4 years ago
3 0
Its carbon because like organic plants come from a tree or plant that takes in oxygen and its produce like apple have carbo
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In the trp operon, attenuation occurs through the recognition of two tryptophan codons in the leader sequence. what would happen
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If a lot of tryptophan is present, the operon will be repressed.
Under intermediate amounts of tryptophan, the change to stop codons would cause the ribosome to stall and therefore would mimic as if there were no tryptophan present.
If no tryptophan present, the operon would be maximally expressed.

a - True. The ribosome would always be stalled in the leader sequence - so this wouldn't matter. However, the operon would still be transcribed because the repressor would be active (remember Trp operon is controlled both by attenuation and repression). True as long as there's not much tryptophan to activate the repressor!
b- True - With no tryptophan the repressor isn't engaged and the ribosome is stalled in the leader sequence.
c- Matters about how much tryptophan is available. So True if there's lots of tryptophan available.
d- I would choose this one as all of the above could be true depending on the levels of tryptophan.

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