What are 3 biological uses for hydrogen?

Question

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Answer 1

a) How about the Krebs cycle?

b) Isn't DNA held together with hydrogen bonds?

Answer 2

Hydrogen is essential to life. It is one of the six bulk elements and it is the third most common element in the human body. Hydrogen is a component of water, without which, life could not exist. Hydrogen also is a constituent of DNA and most other organic molecules. Pure hydrogen is not used by higher life forms, but is metabolized by some types of bacteria. Also used in biological reduction reactions - a key reaction in metabolism.

Answer 3

water, sugars, and complex hydrocarbons.

if you are saying pure H2, there are none.