Photosynthetic bacteria that also fix nitrogen are:
a. Mycoplasmas
b. Spirilla
c. Bacteroids
d. Cyanobacteria

Unlike purple and green phototrophic bacteria, cyanobacteria

a. Produce oxygen during photosynthesis.

b. Do not require light.

c. Use H₂S as an electron donor.

d. Have a membrane-enclosed nucleus.

e. All of the above

Why do cyanobacteria and algae take in carbon dioxide and give off oxygen?

Microbes that reduce N₂ to NH₃ engage in nitrogen ___________ .

Chemolithotrophs acquire electrons from (organic/inorganic)___________ compounds.

For each of the following statements that is true, write “true” in the blank. For each statement that is false, write the word(s) that should be substituted for the underlined word(s) to make the statement correct.

__________ Pigments located in thylakoids in phototrophic bacteria trap light energy for metabolic processes.

The metabolic process photosynthesis occurs in which part of the bacterial cell?

Choose the correct definition of oxygenic photosynthesis:

Oxygen produced during oxygenic photosynthesis comes directly from: