| Term | Definition |
|---|
| nitrogen fixation | =N2-fixation, getting N2 from atmosphere and converting it to ammonia, nitrites, or nitrates (minerals) |
| endergonic, extremely energy demanding | Is N2 fixation endergonic or exergonic? |
| Haber-Bosch Process | way humans fix nitrogen |
| N2 has triple bonds, too strong to be broken and used | Why can't plants use N2 from the atmosphere? |
| Infection of N2-fixing bacteria | How do plants get N2? |
| rhizobia | a N2-fixing bacteria |
| nodules | little bumps on pea plant roots where N2-fixing bacteria live |
| legume | pea family plants |
| infection thread | when rhizobia mulitply & then enter the epidermal cell thru an invagination of the root-hair membrane |
| nitrogenase | a large multi-enzyme that is involved in the series of specialized enzymes & cofactors that fix N2 |
| leghemoglobin | an iron-containing molecule that is produced by the host cell (pea plant) in response to infection of rhizobia. Binds to oxygen instead of nitrogenase. |
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