Problem: Which of the two phosphorylation mechanisms, oxidative phosphorylation or substrate-level phosphorylation, is likely to have appeared first in evolution? Why?

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Endosymbiotic Theory:

1. Nuclear envelope is formed.

2. Proteobacteria is incorporated → becomes mitochondrion

3. Cyanobacteria is incorporated → becomes chloroplast

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Problem Details

Which of the two phosphorylation mechanisms, oxidative phosphorylation or substrate-level phosphorylation, is likely to have appeared first in evolution? Why?

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