How Do Some Cyanobacteria Fix Nitrogen While Growing Aerobically

question 27

Multiple Choice

How do some cyanobacteria fix nitrogen while growing aerobically?

• A) They do not, because nitrogenase is destroyed by oxygen.
• B) They use special cells called heterocysts that protect the enzyme.
• C) They use spores that protect the enzyme.
• D) They do it using no special structures or mechanisms.
• E) They live symbiotically with other organisms that protect the enzyme.

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The difference between a firm's total revenue and its total costs, including both explicit and opportunity costs.

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The highest valued alternative that must be sacrificed as a result of choosing an option.

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