The Enzymatic Machinery to Fix Atmospheric N₂ into NH₄⁺ Is

question 42

Multiple Choice

The enzymatic machinery to fix atmospheric N₂ into NH₄⁺ is:

• A) a means of producing ATP when excess N₂ is available.
• B) composed of two key proteins, each containing iron.
• C) relatively stable when exposed to O₂.
• D) specific to plant cells.
• E) unaffected by the supply of electrons.

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Definitions:

RNA Enzyme

Also known as a ribozyme, a type of RNA molecule that can catalyze specific biochemical reactions, similar to the action of protein enzymes.

Substrate

The surface or material on or from which an organism lives, grows, or obtains its nourishment, or the reactant upon which an enzyme acts.

RNA Hypothesis

A scientific theory suggesting that RNA, rather than DNA, was the first genetic material to evolve in early life forms.

Polypeptides

Chains of amino acids linked by peptide bonds, which can function independently or as part of a protein.