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No, the ratio of nitrogen to oxygen is not changed by altitude.
Yes it is.
lightning & bacterial action (nitrogen fixers).
deleting obscene answer
If a proteins shape is changed it has likely been denatured. This is often a breakdown and rearrangement of the protein.
They changed the amino acid sequence of the proteins.
Nitrogen has been present forever. It is the most abundant gas. Industrial revolution has changed it's concentration.
They breakdown and recycle complex proteins and other materials. Without it, dead things would not decay and return to the earth. (As my friend put it - without the nitrogen cycle the earth would be clogged up with dead things)
Nitrogen fixation.
Nitrogen has been present forever. It is the most abundant gas. Industrial revolution has changed it's concentration.
nitrogen is changed by bacteria into different forms
Nitrogen fixation.