Heterocysts
A) are found in nitrogen-fixing cyanobacteria AND produce catalase.
B) are found in nitrogen-fixing cyanobacteria AND are used to protect nitrogenase.
C) are used to protect nitrogenase AND generate oxygen.
D) produce catalase AND are found in nitrogen-fixing cyanobacteria.
E) are found in nitrogen-fixing cyanobacteria AND generate oxygen.

Question

Heterocysts
A) are found in nitrogen-fixing cyanobacteria AND produce catalase.
B) are found in nitrogen-fixing cyanobacteria AND are used to protect nitrogenase.
C) are used to protect nitrogenase AND generate oxygen.
D) produce catalase AND are found in nitrogen-fixing cyanobacteria.
E) are found in nitrogen-fixing cyanobacteria AND generate oxygen.

Quizplus · Accepted Answer

Heterocysts are specialized cells found in nitrogen-fixing cyanobacteria that are used to protect the nitrogenase enzyme from exposure to oxygen, which would render it inactive. Heterocysts do not produce oxygen, but rather provide a microenvironment that is low in oxygen where nitrogenase can function.