血性军人 开路先锋——“叶挺独立团”纪事（下）
百度 食药监局在不合格食品情况通报中明确表示，对不合格产品在流通领域采取停止销售措施。
Metabolism is the set of defined biochemical transformations occurring within the cells of living organisms.
4 questions from the last 365 days
3
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1
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What does it mean when an EC code has a letter in it?
I am looking through a list of EC number of reactions recorded in metanetx.
And I spotted some with letters
2.1.1.hn
1.5.1.M4
2.6.1.am
4.4.1.n
I haven't seen that ...
4
votes
0
answers
70
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Are Freeman Dyson's theories on the origin of life well regarded in the wider field of evolutionary biology?
Freeman Dyson, a well respected Theoretical Physicist, wrote on a range of different topics during his lifetime, including the origin of life and evolutionary biology in his 1985 book Origin of Life (...
1
vote
0
answers
45
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What fraction of O in dry biomass comes from air vs water?
The net reaction of photosynthesis is, to some degree of approximation,
$$
\ce{6CO2 + 6H2O \to C6H12O6 + 6O2}.
$$
My understanding is that the $\ce{O2}$ comes from water rather than the $\ce{CO2}$, so ...
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2
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2
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170
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Why do animals excrete organic nitrogen compounds instead of N2 gas?
Protein metabolism produces ammonia, which needs to be disposed of; but oxidation of ammonia into water and dinitrogen produces energy, while creating urea or uric acid consumes energy, and excreting ...
