How Do Some Cyanobacteria Fix Nitrogen While Growing Aerobically

question 6

Multiple Choice

How do some cyanobacteria fix nitrogen while growing aerobically?

• A) They don't, because nitrogenase is destroyed by oxygen.
• B) They use special cells called heterocysts that protect the enzyme.
• C) They use cysts 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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