Multiple choice

Cells in some filamentous cyanobacteria that are specialized for nitrogen fixation are called

  1. grana

  2. chromatophores

  3. phycobilisomes

  4. heterocysts

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Heterocysts are specialized nitrogen-fixing cells formed during nitrogen starvation by some filamentous cyanobacteria, such as Nostoc punctiforme, Cylindrospermum stagnale, and Anabaena sphaerica.